You missed the point entirely. Thats okay, I did'nt really explain it all that well. What I was trying to say is I found your post very misleading, like you saying that just because you read this thread you want to go play wow, but in reality you already play WoW so making a statement like that is pointless.
And NO, I do not believe that you can only play one mmo. Every person is different and what one person enjoys can be the opposite of what another does. I played Rift, AoC, and LOTR alongside WoW during thier launches. And this is just personal prefernce but you know what made me come back to WoW everytime? It wasnt the engine, the bugs the other games had, balancing issues, or CS. It was the people. I met alot of really nice people in WoW over my many years playing it. Not to say you can't find that same expierence in any other MMO, but theres some what of a rose tinted glasses effect to take into account.