The StarCraft universe hasn't been touched in a while and is due for a refresh. If they decide to take their time with it and stop changing the game every damn week they should do OK...*if*.
Or who knows, they might decide to come up with something new.
Personally I still delight in the mindless carnage that is Diablo 2. It's the perfect game to play on a transatlantic flight to keep the annoying snoring pig near you awake and get odd looks from everyone else