WoW has been a complete mess since patch 4.0 went live. Aside from numerous game breaking glitches which blizzard should be ashamed of, class balance has been completely out of whack. Oh yeah, no arena for 2+ months is also ridiculous. At this point, everyone is just dying for cataclysm to go live.
The most depressing aspect of the new expansion? Shadowmourne (legendary weapon) will be replaced by a measly req lvl 83 green =(
Also, WoW is not going to die anytime soon (10+ million subscribers or so, they'd be insane to turn off the servers). Everquest is on it's like 17th expansion and still making money with only like 15 servers left, so do the math.