I would certainly not want them to develop WC4 as we have had enough botched sequels the past few years. And I still feel bad with them releasing a video game of the WoWTCG in its most dumbed down version possible, but we'll have to see how it turns out in the long run.
I would be alright with them making a new video game franchise though. But I would not put my hope too high if I were you considering the slope they have been for quite some times now.