General wishful thinking:

Introduce attack food, this would buff second wind and general self heal/dmg done/ dd jobs in general.

I hope they add the unique ability buffs/passives on AF/Future AF upgrades like AF3 version or whatever, like WHM body: cure potency +15%, WAR body: Double Attack x%, BLM: Increase x magic potency + x%/etc but very hard to get (harder than coil stuff for exmaple)
or they could add that stuff right now if they added "special materia" that's only gotten from crystal tower/coil and meldable only once per armor piece or only meldable on af2. (im a personal believer that allagan gear should have come from mythology and af2 from coil (just feels like af2 should be the iconic gear people should be aiming for but whatever doesn't really matter that much)

Make AF1 Revelant in the future, necessary to upgrade to AF3 for example.

There's so much potential for this game =/