yeah but something like that would cost alot, and, if you were playing a game where you had to walk around in real life to walk around in the game, wouldn't you bump in to stuff and hurt yourself?
thats true, but you know that some people probaly would fall and trip over the system or something else and break their necks and sueing nintendo which wouldn't be too great...
The control would suck for a lot of games. Sure, it'd be great for something like Metroid and maybe even Mario but... what about something like Ikaruga? Or how about a RPG... trying to navigate all those menus through movement. Eww...