I'd love the next jobs to focus on hybridity and support.

Red Mage: Taking elements from Mystic Knight, Rune Fencer, Fencer
Puppetmaster: Taking elements from Mime as well (and like Anarchy Online's Agent profession, able to imitate other jobs but in a very very very lesser standard. but giving more utility)
Dancer: Dancer is naturally a Hybrid anyway and has changed in each rendition, I would love a Melee based healing dancer, with physical aoes.