Grampy on 19 May 2008
One imponderable is that this is NA where diet and fitness sell a hell of lot better than Europe or Japan and I don't think any console software has ever reached so far outside the traditional video gamer population; so I don't know any way to make a reasonable estimate. The whole concept is so new that there is no agreement on whether it’s even a game or not. I'm sure it'll be huge in the long run but I have no idea about the initial sales at launch.
If the rumor that there will be 4M sets at launch is true, I wouldn't be that surprised if all 4M sold in a matter of days. But who really knows, this is uncharted territory.
