The whole point of SteamOS is to allow steaming of games. That is the one feature that will change the industry. Instead of buying a console for living room entertainment, you can build a small PC which allows you to bypass the repurchasing of an entire games library. It is designed for a customer with a gaming PC running windows (majority of the market) that wants to play games in a more casual, console-like, way. It is by no means designed for general use and is specialised purely as a secondary machine.