4chan? Okay, if that's really someone from Valve, what is said most likely isn't a stretch to the imagination but I think they would get a lot more support if they were doing something on the desktop and not the living room. Saying that you can run anything you want on SteamOS or transform it into a desktop environment (maybe or maybe not) isn't quite the Windows replacement everyone dreams of having.
Pretty sure that's not the goal. The goal is to create an amazing gaming platform. Not to replace the PC and all that it can do. Along with that goal comes driving the market forward and getting distributors to re-think their current strategies in terms of PC gamers instead of assuming it's a dead market. Hopefully. If it ever gains ground.