The main/sub mechanics are probably the greatest single component of FFXI and give it a true unique approach towards character progression and diversity.
I'm not sure if SE was the first to impliment this system, but it was genius at the time.
We once thought 75 was the perma-cap. Today, we know 99 will be the cap.
So here's my suggestion SE;
Synergy/Fusion Jobs that will be Lv.100.
Hold on, don't jump me just yet. There's a lot more to this than just the "Lv.100" your eyes glared at.
My idea entails the addition of new Lv.100 jobs that require Lv.99 in 3-4 other specific jobs, followed by a quest. These jobs would be accessible only in certain zones, with limits of 6 players per zone. Think about how in abyssea you can access atmas. In the new Lv.100 minimum requirement zones, you can access said new "synergy/fusion job" providing you have the requirements (needed jobs at 99)
For example,
I'm sure the community can throw out a lot of great ideas. Here are some of my SUGGESTIONS.
Sage Knight
Lv.100
requires PLD Lv.99, WAR Lv.99, DRK Lv.99, RDM 99 to activate quest.
Job Description:
Rank C in all weapons - with Rank A++ in sheild and sword.
Rank B in all magic - Capped Elemental magic @ Tier4, and AgaIII's, CureV, Haste, Refresh, ProtectV/ShellV, Reraise, SlowII, ParaII, Gravity, Aspir, Stoneskin, Phalanx and all Absorb Spells, all en-1-2 spells.
Shogun/Warlord/Berserker/Champion
Lv.100
Requires WAR Lv.99, SAM Lv.99, DRG Lv.99, RNG Lv.99
Job Descritption
Rank A++ in all weapons- Access to all non relic, non empyrean Ws's.
High HP
High native Atk
High native defense traits, abilities
Tier2's of Berserk, Meditate, Seigan/hasso, Aggressor, Shield Bash and add some new stuff like Charge.
Rogue
Lv.100
Requires NIN Lv.99, THF Lv.99, DNC Lv.99, MNK Lv.99
Rank A++ in all evasive/defensive traits - Parry, evasion,
Sensie/Mentor/Grand Master
Lv.100
Requires MNK Lv.99, NIN Lv.99, THF Lv.99, SAM Lv.99
A++ in H2H/Katana/Dagger/GK/Staff/Polearm
High HP
Dark Sage
Lv.100
Requires RDM99, BLM99, DRK99, SCH99
Access to all spells
A++ in all elemental/dark magic
Access to meteor/comet/ultima/Haste2/Hastega