Why are we even assuming certain jobs will only be made available to certain classes. They state "...playing as a particular job will render you unable to equip certain actions of other classes..." which to me implies that all jobs will be available to all classes, and that as such each job will simply offer an additional set of spells/abilities. It makes sense - we're currently able to equip "Cure" on any class, so what would stop any class having access to all jobs?