WoW has already alienated a good portion of it's old school playerbase when they launched Burning Crusade. It used to be this balance of old school MMO's and the new feel it was forging in an old genre. Then they made it a PvP minigame for the other 9 million who subscribed and left the purists like me and the other 999,999 people still wondering why we pay our $15 to play a game that looks the same but is completely different and pandering to the casual player.

So in short, I agree, WoW WILL kill itself. It doesn't need another game, just the same ideals of getting more and more numbers through dumbing down gameplay and more crappy pvp minigames.