Let's be honest, WoW has probably far below 1M active subs right now. The game/company has have gotten a big hit of negativity, SL already was off a bad start after a content draught at launch already.
People are mad, Blizzard barely giving their playerbase any content and the developers arent happy either.
Rumours are that there are barely any work being done when it comes to actual content.
So how low do you expect the subs to be at right now? 500k? 750k?