I think I understand why they were having so much trouble with the wii demo. The wii remote, at it's base, uses IR to figure out where it is, the sensor bar on your tv is really just a pair of IR points that can be replaced by lighting two candles. And effectively what they were doing was playing while the sensor was trying to make sense of that MASS of heat called an audience
That said, anyone else notice that Zelda was the ONLY demo they made? I mean, Xbox was 90% demos, and I'm assuming that PS3 is in close to the same boat.