Essentially, the problem is that blizzard has conquered gaming. I've played many different MMORPG's, from WoW, to City of Heroes, Rift, and others...and I can't find anything that beats WoW (as most things are trying to emulate WoW)...but I'm bored to death with WoW.
In the RTS world, it is difficult to imagine what else can be done with the genre. Starcraft set a high bar, and was emulated over and over and over again. What can you do to make it better? Talent tree was interesting, buying tech to personalize your army....but the game play is the same.
Maybe I'm just an old fart who is no longer impressed with updated graphics layed over a decade-old concept...