I'd like more branching jobs, like SCH/SMN. I think it's a wasted opportunity for them not to pursue this, as it's easier than creating a brand new job.

Pugilist>Tank Monk
Archer>Priest(Rosa FF4)
Lancer>Tank Dragoon, with a equippable dragon on the off hand.
Marauder>Berserker(DPS)

Stuff like that.