Who thinks that Left 4 dead 2 will get split screen coop on PC soon, now that Big picture is out. They already have it on consoles, and it is possible to get on PC too with some trick's so it will probably be very easy thing to ad. Besides Portal 2 just added split screen support on PC.
I play most of the controller superior PC games on my TV anyway, like Assassins creed, racing games and sidescrollers.
NB: Don't comment and say it will suck and is a stupid thing to ad just because keyboard and mouse are better. I KNOW that, i prefer keyboard and mouse on FPS, and 3PS and games like that. But some people have a controller and may want to play it with a friend on TV, and it doesn't take anything away from the people that want to play it with keyboard and mouse.