Wireless keyboard would be difficult though, since you wouldn't be able to see the keyboard and not everyone can touch type. Unless if you mount a camera in front of it, which would solve the bumping into things problem also.
I just realised the sheer genius and potential of your avatar!
Think about it, it's not such a bad idea! It's a perfect way of getting rid of outside distractions and getting stuck in with your TV viewing. Virtual reality glasses with a TV feed - It's a sort of home-version of IMAX! Make a DVD slot for it and all...