Better if

It was voice controlled

I did something like this

My honours project at uni was a gesture controlled television (okay, the television bit was a fake in vlc running starwars fanfilms, film trailers and red vs blue episodes but never mind that bit)

After a short while playing with it it became very intuitive to use. I was lazy and just after the marks so it used a menu with four directions as controls. Assuming you were wearing sleeves and sitting in the designated chair (lazy remember?) you could channel hop, control the volume and torture people with the bee gees with ease.

Bloody Great Idea

For most of the couch potatoes I know it would double the calories burned in a day waving their arms like that ! Which is why it wont take off until they develop the 'slight twitching of the finger' version :)