WoW isnt going down anytime soon; too big, and many people invested too much time, "life", and money in it.. basically, they are trapped/hooked.
All current MMOs are just grindfest games, with extremely boring and repetitive quests, and purely linear power progression.
I wish i could play one like a FPS, in settings like STALKER (post-apocalyptic place where the environment itself is dangerous), L4D(zombie SURVIVAL game, preferably) or Star WArs/Mass effect (futuristic).
Fantasy settings right now are boring, too flashy and overused, the only one i would want to see in multiplaer or MMO would be a fixed Oblivion for multiplayer, where ennemies dont need a million arrows/sword hits in the face to die.