This whole, "pc gaming is a niche" nonsenese has been repeated for years (at least a decade) and yet nothing has changed. If anything pc gaming has increased in popularity in recent times. Repeating it over and over again, contrary to what some people appear to think doesnt make it true. Yes consoles command a large part f the market, but pc game sales are still strong enough that developers continue to support the platform, especially with games whose mechanics favor the platform.
Dont like pc gaming, fine, ignore it.
I enjoy my xb360, but its pretty humble compared to my pc gaming rig (which is connected to the same big screen 1080p tv, in the lounge with joypads, etc. ). The pc blows it away for audiovisuals.