Blizzard is already instituting things they've learned from their other products, like Starcraft 2 and Diablo 3. They aren't going to shut down WoW because they make a FOURTH game, simply use it to make their products better. As long as WoW is making a large profit margin on their MMO's, they will continue to develop them. Its already noticeable that they're trying to simplify the expansions by selling them as a bundle and reducing the calculations needs to perform x and y, while providing players with z. I'm honestly saddened that people always jump on the doomsday bandwagons so eagerly.