ROFLMAO, WoW is a n00b MMO. It has 0 longevity. I'll admit it has done well but so did the Sims! Why? Because they are both very easy and accessible. There are plenty of MMOs out there that are far from dead and offer a far more complex and challenging game world.
I got to level 30 in WoW in about 7 days and cancelled my Sub. Thats a joke. Its not even worthy of being called an MMO, it's just Diablo with better graphics. I will give Blizzard kudos on the interface, it is very good!