I don't think trying to branch out of the game space is a really good idea for Blizzard. They would be far better served by delivering a quality Warcraft or Starcraft game outside of the MMO space.
I think a Warcraft Adventures/Lord of the Clans style game would probably go gangbusters as a God of War styled action RPG.
I think Starcraft is a franchise that has a lot of potential for a new game and they could probably make a very fun Starcraft: Ghost which borrows a lot of aspects from Mass Effect.
Maybe if they spent a bit of time cultivating their IPs instead of soiling them all with their monetization they would be far better off.