WOW does not feel as social as before. before you would see tons of ppl in the city doing stuff or just AFK but you know they were out there. Now it's just garrisons. Although i think it's cool idea it would be only a hub for some mats and quests and all the rest would be in a main city like the ones they were supposed to launch but never did. I think it would feel epic to release them with some epic quests to unlock the cities and instead of ashran would have epic pvp world if he need to raid the other faction city in balanced groups.
I hope you guys have some nice ideas.