In reality, I (and most people) would get tired of this fairly quickly (less than an hour, on the outside!), but like "Milo," what it promises for the future is incredibly exciting. Virtual worlds are becoming more interactive and reactive.
Take what already exists with Nintendo Wii, add in the interactivity promised by products like Microsoft XBox 360's Natal "Milo," and the oddly engaging interactivity like Playstation's "Eye-pet," and the result, potentially, is a uniquely engaging new form of entertainment.
"Worlds of Warcraft," a Massive Multiplayer Online Role Playing Game (MMORPG) is a enormous 3D world bringing millions of players together in a richly-drawn fantasy environment. MMORPG games like "WoW" are already responsible for billions of dollars in revenue each year. Make these games even more interactive, as this new technology promises, and the result is a new form of entertainment that will prove more engaging than any that has come before - and a business that could generate more revenue - and more opportunities - than any form of entertainment in history.