3D screen would really not work. With the 3DS it works because as a handheld you naturally hold it in the right zone. As a controller for a console I doubt you will be holding it as steadily in the zone when you're not looking at the screen, meaning you'd have to re-align yourself everytime you looked down. Would just be a pain.
@Tarheel. You can use a stylus on a capacative screen, it just needs to be conductive.








