The number of people on the servers are way down and guild recruitments are pretty much nil.
Yeah I don't normally agree with you on well...anything but I have a few friends who play the game on and off, they are always complaining about the server pops being down and how the raider turnover is insane from all of the people quitting. The old guild a friend and I had built has been around since launch day and never needed to merge until a year after Lich King. Now they've had 4 mergers in a damned year just to keep the thing kicking. I think their WW playerbase grew but their NA/EU playerbases probably fell significantly.
Having seen the Cataclysm "features", they won't be getting me back either and I doubt most of the ex-players I know in real life will bother either. The casuals tend to screw around on their mobile phones and do other assorted nonsense these days.