I like this idea, although it would probably make sense to have something like (In my opinion):

Class = Caller

Jobs = Evoker = DD job, perhaps would gain access to spells akin to classical FF summoning, so they might cast Judgment Bolt, but not summon a pet for AoE lightning damage etc.
= Summoner = Support/Tank class, can call an avatar of a primal for permanent assistance, without perpetuation costs ideally.

Obviously haven't thought about it much, but jobs might be the way to go to please everyone.