You know how in TBC, each rep were tied to a certain set of heroic dungeons?
So for example, Honor Hold rep was tied to running Hellfire Citadel dungeons. Cenarian Expedition was tied to the Coilfang dungeons, and so forth. Wouldn't it be a logical thing for blizzard to tie interested factions rep to the dungeons their story and lore are tied to?
It was brilliant design in TBC, why wouldn't it be now?