I agree, I'm even the kind of person who uses a controller in FPSes. A wired Xbox controller already takes care of that. Native support is common enough that you almost never have to ask if a game supports controllers. The only game I have on Steam and play with keyboard/mouse is Scribblenauts Unlimited. Everything else* I have, mainstream or obscure, has native 360 controller support and works just like it would on a console, no questions asked.
What I'd wish for would be to have Nintendo's controllers gain native support too... in my case, I'd then have three good controllers to use, two of which would be wireless. Which brings me to why I think Nintendo and Steam could be a match made in Heaven. How great would Wii U controller compatibility be for people who already have them, and get a
Steam Link in November? I don't need a Steam Link, personally, because my setup already has my computer connected to my TV. But soon, it'll be easy for anybody to connect their computer to their TV from wherever the two are in their house. With the right marketing strategy (such as "guess what else you can play Mario Kart on now"), it could even become commonplace. Nintendo holds local multiplayer sacred, while it's probably PC's greatest weakness, for now. PC could benefit from Nintendo here. Suddenly we have a cheap little box that makes
cheap big games playable on a TV without any need for a creative setup. People who live with the people who have this will ask, when can we play this together? In what new ways can we play this together? If Nintendo answers, they're sure to lead by example. Again, this isn't what I predict will happen, but it sure is what I hope will happen, my idea of a best-case scenario. Nintendo, PC gaming, and people who play games could all benefit.
Or they could blow it all by not getting involved with Steam, if they stubbornly cling to this "membership service" like EA with Origin and Ubisoft with uPlay. Or maybe they don't mean games are coming to PC, just that it'll be like Miiverse and be usable from them. Big waste of an opportunity and a bad-case scenario if you ask me.
*except Dark Souls 1, which has a completely abysmal port, and basically requires a mod called DSfix to work like it's supposed to. A few files dropped in where they belong and
now it works like it's supposed to... except it's still a bad port, terrible optimization, even though my PC
could run it at 60fps I have to lock it to 30 or I risk death by wonky elevator collisions. And the netcode is completely awful. FROM learned their lesson and DkS2 is much much better.