Hard to say, on one hand one could say that the PS4 and One will steal the momentum and attention but, on the other hand, there's a case to be made by stating that the demographics for the Steambox and the PS4/One likely aren't the same.
The Steambox appears to be aiming more towards a "living room PC" kind of crowd and would probably focus on different games as well.
I'm a lot more excited about SteamOS though, that could really become something over the next five years or so.







