Has anyone considered the possibility of classes that branch?
I know it's a bit much to expect from them at the moment, but i was thinking each (or at least some) classes would unlock multiple job quests.
For example: Conjurer reaches a designated rank which in turn opens up multiple job quests. This would allow a conjurer to then specialize by becoming either a Black Mage(by undertaking the black mage quest) or a white mage(by doing the opposite). Although i could see allowing both quests to be undertaken. You could then have one job use a radical and the other use a wand. Just ideas, but not a rediculous concept.

Some job ideas
Gladiator = PLD or Assassin(using daggers and learning to dual wield)
Lancer = Dragoon(with pet) or Halberdier(lance + shield tank)
Marauder = Dark Knight (unlocking specialized magic) or something that allows access to great swords

there really are alot of possibilities if you think more FFtactics.