The Nintendo Wii uses a controller dubbed "the Wii Remote". Microsoft's Project Natal uses a controller called "the human body". What does Nintendo's Shigeru Miyamoto think?
I don't think I could create an experience that truly feels interactive if you don't have something to hold in your hand, if you don't have something like force feedback that you can feel from the controller.
Oh. So we need controllers for people to play? If the goal is immersion, isn't simple gesturing more intuitive than holding a plastic remote and pretending its something else?