I don't think it could work as an add-on. Part of the success of the Wii was giving you the exciting bit and then giving you the means to showcase it right out of the box, namely the Wiimote/Nunchuck combo and Wii Sports. Even if this peripheral were to sell as outstandingly as the Wii Fit Balance Board, not having it standard will stifle support and stifle proper development for the input device.








