Touchscreen on a large (say 50" or more) plasma screen is a great idea. The whole stylus idea is really lame though, and drawing on your TV? Seems extremely pointless and gimicky.
If I could simply walk up to my TV and use an intuitive touchscreen interface, I think it would be awesome. Especially for not having to search for the remote everytime. The only caveat again would be size, I don't think it would work well for smaller tv's (40" or smaller).
Reminds me of the evolution of the mobile phone. Touchscreen works so much better than physical keys, and makes the interface open to so many more options.
Anyway, combine this with voice commands or something when I don't feel like getting up to change the channel and I can see this finally replacing the ancient remote control.