Demonology is the only one that benefits from stamina, but without sacrifice and a good SP, you're pretty much a burden.
Demonology doesn't have much use in 19s either. If you want to play warlock, either stack SP and go affliction or standard burst with destro.
Resto Shamans are on the downfall without healing surge.
Resto Druids became less viable without healing touch.
Holy paladins and Disc/Holy priests are the only viable choice for healing.
Paladin isn't usually suggested because of the increased amount of them, but that's just ratio speaking.