However as with Android, that isn't enough to get it to take off. Android had huge traction problems to start with until they managed to get the big device makers to train users and market the devices. SteamOS is going to have the same rough and long launch period, but the ultimate payoff is very big as the tech is all there and it's just a matter of getting the big game publishers to join up.
As with mobiles and Google, if anybody can succeed in the gaming industry, it's Steam. So I definitely wouldn't write this one off, I think it will take off in a few years time if they can get the big players - both software and hardware - to join up.