I'd like it if Jobs were not limited to what 'class' you are.

Example, if you unlock Warrior, you could use it with any melee weapon.
Warrior + Axe? + Spear? + Sword? Do it. The weapons influence the various weaponskills they get plus the weapon specific abilities, Lancer's Speed Surge Vs. Axe's Steadfast Vs. Sword and Sentinel.

Warrior focuses more on damage, less so on tanking (though still capable of it, paling in comparison to Paladin for pure 'tank'ness). You mix in what ever special things you remove from the classes and gave to Warrior (I assume this will be happening since so many classic jobs have their abilities spread EVERYWHERE right now).

For Mages... Mages are kind of a mess right now. CON is our BLM and WHM while THM is... what ever got squeezed to the side. Arcanist is likely our candidate for Geomancer, so maybe Scholar for THM? I wouldn't be surprised if SE suddenly or gradually shifts abilities in and out from classes to job specifics.