I still really don't understand the reason for PS4 and Xbox One existing at this stage. Ok the Wii I kind of understand because they go in a very different route with that platform and they kind of revolutionized the whole moving around interacting with the game concept. That godfather game for Wii (The Black Hand I think it was called?) was pretty sweet, you could bitch slap people by flicking the remote.
But back on topic, what the hell does PS3/4 or Xbox 360/One have over a PC? It's like the same shit but with worse controls. Let's get real here.
It's all about games (exclusives) and marketing. And to be honest consoles are a bit easier for casual gamers.
That's circular though - publishers wouldn't make agreements to produce exclusive titles if gamers didn't support unnecessary consoles. The real question is, why are gamers still buying Xboxes and Playstations when they can have a better gaming experience on a computer? If they didn't buy the consoles and sales dropped, the game companies would go full PC mode in a heartbeat.