Well to answer the question the wii's selling potential for the 'casual' blue ocean demographic is massive, greater than any console in the history of gaming. Wii fit is a testament to that. For the more traditional 'hardcore' titles however I would say the wii's selling potential is about the same as the 360's is in its core demographic. So essentially much less than the previous category but still a very high amount none the less.
The interesting thing to note is Mario Kart wii. If Nintendo is able to make games that were traditionally considered core games and expand them to a wider audience then I would say the wii's selling potential is much higher than the 360's or any other console. Since this has only been seen with one core title however it is yet to be seen if Nintendo can reproduce the effect with another one of their traditional titles. Of course there is also the group of gamers that would hate for this to happen as they would see it as a watering down of their favorite games.
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