As far as the job system will go, I personally liked one idea that somebody brought up before, where you equip your 'class' weapon, and then you are able to choose from a specific selection of jobs that are associated with that weapon. For example, sword could let you choose Warrior, Red Mage, or Paladin, and a staff could offer White Mage, Black Mage, Red Mage, Summoner, etc. I think that would be kinda cool.

But in all honesty, they really gotta fix that action bar issue. It's annoying when changing classes often. That alone would make leveling up various classes so much more motivating.