I think you hit the nail on the head. I do (don't yell at me here) agree with him in some sense though. Starcraft 2 got boring for me fast and felt like almost every other RTS game I had played, just without the freshness of certain offerings such as Ground Control (haha, yeah, ten years old?) and Company of Heroes. I'm obviously not the biggest RTS gamer, but I used to enjoy them. And I kind of think that maybe that's what he's getting at; except for the small percentage of people who absolutely love them, RTS games are stale and no longer attract audiences who weren't going to go out and buy every major strategy game anyways.
Yet, thinking about it now, I know nothing of Xcom and don't think it's even close to RTS. So you're right: He's probably just a retard, because shit like turn based strategy is kind of timeless.