Once gigabit internet becomes a thing, I think the game console's days are numbered.
A Netflix service will come (maybe from Netflix themselves) and you'll get all your games/movies/music ala cart from a streaming service.
That and in a decade or so I think even phones/tablets will be capable of generating near photo realistic graphics, good enough to stream to any display around a house that many people may not care for a dedicated "giant box" console.