Yes because you can use the current system to mix and match skills to create either old school jobs, or design your own, you just don't get recognized for it in game yet.

I could make a White Monk, or a Black Mage, or a White Mage, or a Paladin, or Dragoon, or a Berserker, or a Warrior right now.

I just don't have the title of it, but the skill load out is what is necessary to fulfill that job.