If you take over a company, you don't necessarily want to plunge it into even more chaos than the acquisition will create already by immediately getting rid of the CEO. It's entirely possible that they will get rid of him after a transition phase.
I'm hiring now, and I had the pleasure of interviewing someone who was leaving Blizzard. He was pretty sharp and I was bummed that I had to pass on him.
Anyway, I think this acquisition will actually stop the bleeding snd create some stability