If it possible, than we can covert TV to a full web surf device with halp of firefox, a bluetooth dongle, keyboard and mouse. We can also support keyboard and mouse via USB hub, but bluetooth approach is comes better to my ear.
And also I want to play some game like Quake.

Instead of X, there is SDL library is already available and games like Quake could be run on it, couldn't they?. I don't know about game play speed but I comes possible to me.