Is there a new game out or something? WoW had over 8 million people at a time, and now it's down to 2 million alliance and 1 million horde. Those are ridicules numbers so something has to be up.
http://www.warcraftrealms.com/realmstats.php?PHPSESSID=618ccb16cbce7b5cfed7f21cbbca4883 Scroll to the bottom of the page to see for yourself.