Well, essentially you could have said the same thing about Everquest and WoW but at the same time, I know a friend that, up until recently, still played the original Everquest. The fact is that there will always be an audience..... -er gamers that will buy certain games. The fact is that WoW is a popular game that tailors to a wide range of consumers. Heck, I know jocks and football players who play WoW. WoW, in a sense, defeats the the whole nerdy D&D, fantasy, role playing persona. It's also a fairly low, resource game that will allow virtually any computer with a graphics card of some sort to play. A reason why Everquest never got as popular as it did. It will be interesting how Warhammer will play out because, personally, I really don't know anybody who got into that, let alone, myself.
Edit: Also, on a personal note, one reason that might deter(?) me from playing Warhammer is the fact that it's produced(?) by EA which I have personally had bad experiences with. Many EA games I've played were high resource games and very glitchy.