I would like to believe there will be multiple pet jobs like in XI, and that they will be jobs, not classes. i.e. Conjuror get summoner, THM get necromancer, MRD get beastmaster, LNC get a dragon pet job (can't say dragoon since it sounds like they're coming first), PGL get pupetmaster... Maybe far down the road but basically an expansion that offers all classes a pet job. This would also solve the problem of everyone switching to the one class to summon...

The pet job would basically give you a pet but SEVERELY restrict your own abilities.