I've actually thought about this recently, and made some list of Jobs, their weapons, and their skills. I've also listed down hundreds of different weapons in real-life that could be used, but I won't post it since It's too much :p
I Know there's another Thread for this, but I think my post is too long >.>
Here's my Idea for Class and Jobs:
Divided into several Tiers-
[Tier 0] > [Tier I] > [Tier II] > [Tier III] > [Tier IV]
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[Proficiency of Adventurer] > [Separate Jobs]
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[Tier 0] Adventurer's Proficiency
[Adventurer/Freelancer] They are Versatile, able to wield any weapons and skills.
Weapon: All/Any Ability: Cross-class skills only
This Job is a mix of the Old Class and Armory system, It will have Proficiency(Level) of all weapons.
Once a Proficiency is on a certain level, they are able to unlock the [Tier I] Jobs. It can wield any weapons and equip any ability, but there is a certain Cap for say, a Sword-wielder equipping Archer WS, etc.
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[Tier I] Proficiency & Jobs
[Pugilist]>[Monk] A Deadly Ala mhigan Martial Arts. Their body is their weapon.
Weapon: (x2) Fists / H2H Ability: Elemental Fists, Aura skill, Kicks
Role: Quickest DPS, but with the average accuracy, misses a lot
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[Lancer]>[Dragoon] Originated from Ishgard, their lance pierces through thick monsters.
Weapon: 2H Pole-arm Ability: Jump, Dragon-breath
Role: Critical DPS, Piercing attacks and Jump that evades any attack.
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[Archer]>[Bard] First developed in the wars' past, the way of the Bard is almost extinct.
Weapon: Bows & Arrows Ability: Sing, Aim
Role: Bard can reach a "good" DPS line If it is geared. It's Support Song is a great boost.
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[Marauder]>[Warrior] Ancient way of war developed by the mountain warriors.
Weapon: 2H Great Axes Ability: Berserk, Arts of War
Role: Sub-tank DPS, deals average DPS while being able to Tank pretty well.
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[Gladiator]>[Paladin] Secret arts of Paladin passed down by Elite of Sultansworn.
Weapon: Sword and shield Ability: Cover, White Magic, Sentinel
Role: Best Tank in the game. Has thick HP, thick Defense, but very low Damage.
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[Conjurer]>[White Mage] Forgotten white magic lives in the hands of Elder seed-seers.
Weapon: Cane, Wand & shield Ability: White Magic, Holy Magic
Role: Best Healer in the game, fully supportive role but can utilize Holy for a Last-attack.
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[Thaumaturge] > [Black Mage] There existed an arcane art known as black magic.
Weapon: Staff, Scepters & Shield Ability: Black Magic, Ancient Magic
Role: Highest Burst DPS, can Combo constantly If you watch enmity, MP runs out fast.
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[Tier II and so on] Proficiency & Jobs (Feel free to specify which jobs for which Tier)
Unlocking Job Tiers-
Tier II Job Unlocking: 2 Lv.50 TI Jobs, 2 Lv.30 TI Jobs (Different)
Tier III Job Unlocking: 2 Lv.50 TII Jobs, 5 Lv.50 TI Jobs
(This is the basic Idea)
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[Bushido] > [Samurai] These Mighty Samurai excels in the way of Katana.
Weapon: Great Katana Ability: Bushido, Demon Killer, Iai
Role: Combo DPS, Emergency-tank with Counterattack and transferable hate.
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[Assassin] > [Ninja] A Killing machine who's blade is trained to assassinate.
Weapon: (x2) Wakizashi, Tanto Ability: Ninjutsu
Role: Burst damage, Slow down on Cooldown. Uses Throwing Weapons as well.
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[Scout] > [Thief] Specializing in covert actions, thieves aim for stealth attacks.
Weapon: (x2) Daggers, short-sword Ability: Stealth, Sneak Attacks, Steal
Role: Manipulate Enmity and have High Constant DPS, Lowest HP and DEF.
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[Enforcer] > [Red Mage] These Mages wields mace while casting white & black magic.
Weapon: Mace & Shield Ability: White Magic, Black Magic, En- Magic, Element WS
Role: Enhance Elemental Arms, Use Spellblade WS and White/Black Magic for Support.
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[Mystic] > [Blue Mage] Decimating their enemies with magic mastered from opponents.
Weapon: (x2) Whipsword Ability: Blue Magic, Mysticism
Role: Variable Class, a monster of one with its' Monster Skills.
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[Musketeer] > [Corsair] Unrivaled Aim with the guns, they possess an Iron-willed heart.
Weapon: (x2) Pistol/Gun, 2H Sniper Rifle Ability: Gunnery, Snipe, Gamble
Role: Able to switch positions during the Battlefield and use Luck-based skills for Party.
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[Scholar] > [Sage] Extensive years of study has granted these people vast knowledges.
Weapon: Spellbooks Ability: Time Magic, Geomancy
Role: Haste, Stop, Slow, etc (TP, HP/MP Regen, etc) Control Weather with time.
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[Bladedancer] > [Fencer] These practitioner wields rapier for accurate, elegant combat.
Weapon: Fleurets & Buckler Ability: Fencing, Imbued attacks, Rally Skills (PT Critical Up)
Role: Highest Accuracy DPS, Enfeebling strikes and Support allies' DPS (Crit+, Atk+, etc)
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[Arcanist] > [Archmage] These archmages studies the way of Arcane Magics.
Weapon: 2H Arcane Staff Ability: Arcane Magic, Trap-Magic
Role: Utilize Arcane Magic to Trap enemies and render them temporarily useless.
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[Evoker] > [Summoner] Summoner are born when Avatar pacts are forged.
Weapon: Orbs Ability: Summon Avatar, Summon Spirit, Elementals
Role: Elemental Companion, Half DD and Half Support. (Light and Dark Elementals)
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[Mediator] > [Beastmaster] Communicating & controlling Animal is a Beastmaster's forte.
Weapon: Whip Ability: Tame, Monster Commands, Monster Traits (Seedkin Killer, etc)
Role: Crowd-Control, make enemies fight themselves, or capture them instead.
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[Soldier] > [Dark Knight] Fallen soldiers of Darkness, they are feared as The Reapers.
Weapon: 2H Scythe / 2H Sword Ability: Several Dark Magic, Siphon Spell, Blood Skills
Role: High-but slow DPS, surviving Battle while dealing Siphons and Blood skills. (Drain)-------------------------------------------------------------------------------------
[Shaman] > [Green Mage] The Green Mage studies the art of Enfeebling Green Magic.
Weapon: (x2) Magic/Battle Ringbands/Gloves Ability: Dark Magic, Green Magic (Enfeeble)
Role: Purely Enfeebling Job, deals enemy with Poison, Bleed, etc.
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[Gunbladier] > [Imperial] Ala-mhigan spies have brought back a new tech of war.
Weapon: Gunblade & Gun-attached gloves Ability: Shoot, Magi-tech, Blast Wave, Aether
Role: A Balanced-Adaptive DPS, however some of his skills generate massive Enmity.
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The Idea of this is adapted from XIV's Class > Job system, since I don't think SE is going to throw out the Class system, this is merely an Idea.
If you feel this is a spam thread, let it die in the seas of dead-threads :p
P.S.
I apologize If It's difficult to read :p
EDIT: Added a few Ideas from Comment, thank you for the feedback!