So yknow how PVP talents can add schnazzy new abilities without affecting PVE gameplay?
They should add spells that can only be used in the open world. They could play on the classic fantasy of learning spells from trainers by including NPCs throughout the world, like a druid who can teach you that symbiote thing from a few expansions ago. Intimidating shout, exorcism, basically all of the pruned abilities could be put to use again in quests, maybe even the spells from the Legion artifacts?
I'd buy it.