Two cameras sitting on your TV to track your moves in 3D, with processors powerful enough to make it actually good tracking, unlike the original eyetoy. It would be able to convert your body into a 3d model and truly immerse you into the game. Your movements would be translated real time to the model's movements, and you wouldn't have to hold a silly remote control.
Game Visor? I've seen them in my local mall. I'm going to say no. It blocks your sight of anything else. People don't feel comfortable donning those and having no idea what is really going on. Now, solo hardcore gamers like the idea, but casuals and party gamers don't.







