Almost all the people cried about Pandas and it being a childrens game.. if they played previously, still played. I have no real evidence or facts on this.. but I know that a lot of the people who I played with for years said they'd never play MoP, but they're all still on my RealID. That may not be the case for everyone.. in fact, I'm sure it isn't.. but people love a gang mentality. "PANDAS? WHAT IS THIS KUNG FU PANDA? IM NOT 12 IM NOT PLAYING THAT! MUTINY!" However.. if you've invested this kind of time and money into a game, and gotten good at it.. it's not really about the content as much as it is a habit.
Blizzard said that tons of people have always unsubscribed, but they were always able to get more people to subscribe than those who unsubscribed. So really, it's not about focusing on those who are leaving (I know that sucks to hear when you've been loyal to a game for years).. it's about focusing on recruiting kids who were 4 when WoW came out, and are now 14.. and are of age to give it a shot.
The trouble is, with a game that's 10 years old.. new gamers most likely feel overwhelmed at jumping into a 10 year old game, not to mention a game that has 4, soon to be 5 expansions. Even with Blizzard's new deal of including most of the expansions in the purchase.. imagine it from a true outsider. It has to feel overwhelming. This is what Blizzard needs to overcome. They're not worried about those who have been subscribing for years.. because I'm sure they have data and numbers and expect a certain percentage to unsubscribe every quarter. They're worried about not getting NEW players to join in. Think about this for a second: if the subscriptions dropped 1.2 million last quarter, or whatever it is.. think of what the TRUE number is. They're not factoring in new subscriptions. So they may have garnered 800,000 new subscriptions last quarter, but lost 1.2 million.
They're less concerned about the loyal guy who's been playing for 7 years leaving. They're more concerned about the kid who was in diapers when WoW was released now getting into games, and getting his parents to buy him a subscription.