I'm not sure if you're serious or not, but I am. Steam has already started to offer non-game applications. If SteamOS gets a large enough installed base and provides a good-enough platform for desktop/couch-side apps other than games then things could get interesting.

EDIT: Of course, it would help if Valve had someone in charge with a record of success in desktop app platforms. Well http://www.computerandvideogames.com/172835/interviews/creat... fancy that.