You have to wonder about all the nay-sayers here... I mean, if they were remotely close to a typical population sample the Wii would've tanked and there wouldn't be an Xbox 360 or PS3. I met their earlier generation while they were pooh-poohing those new-fangled pointing devices, what're they called, some sort of rodent nickname or something... oh, yes, the "mouse", which they assured me would never amount to much because serious computer users used keyboards.*
I'm not saying that Kinect is the next mouse... I am saying that the nay-sayers tend to follow the conventional wisdom and therefor miss the big changes.
I'll wait and see what happens before making any big pronouncements, myself.
-- Steve
* They also tended to be command-line interface die-hards equally opposed to MacOS and Windows 3.1. On that I agreed with 'em... which shows I can screw up big too.