Diablo 3 for all it's faults isn't even a year old. I think people can wait for it's expansion a little longer, don't you?I just don't understand why you would put those 15 developers on Hearthstone. There are so many projects that players are looking forward to.
Just to name a few:
Diablo 3/The Expansion
Warcraft 4
All Stars
WoW Expansion
Next SC2 Expansion
Warcraft 4. They already have a Warcraft game and a RTS out at the moment. Sure a Warcraft 4 would be nice for the people waiting on it, but from Blizzard's point of view it doesn't make sense to be releasing it now.
All Stars. Who the hell is still waiting for All-Stars?
WoW Expansion. Pretty sure this in the works as we speak.
Starcraft 2 expansion. HotS was just released a couple of months ago.
So, for cost of hiring 15 people they can either have a brand new game providing another revenue source or they can stick them in the dev team for one of those other titles and do what exactly? Get Legacy of the Void a month earlier? Split both the SC2 and WoW audiences by releasing Warcraft 4? A faster release to the expansion of a game which according to yourself is pretty poor.