People are afraid (and for not a good reason) that ATVI lacks the ability to keep their products relevant and that they could eventually not have these games that basically.. print money.
WoW2. Yeah. It will happen eventually. They want to keep as large of a user base as possible so the computer specs required for WoW are very low. Even if it's 3 years away, it would be announced a couple of years before then and that should keep interest in this stock. WoW is an addiction and people live like crap to fuel it. How about Warcraft 4? Just saying that Blizzard alone has a ton of tricks up their sleeve.