Let's assume by some miracle, Nintendo was able to make the Wii as powerful as the other systems, without breaking $300 in MSRP, or selling it at a loss.
Either they keep the traditional controller, and still make the GC games they were making, which mostly don't have mainstream appeal, and the system continues to sell less than the last one. Porting be damned, the system would have too little overall sales (userbase doesn't affect individual game sales, but software shipments of all the games on a system*).
Or Nintendo makes the Wiimote ,and Wii Sports just with greater graphical detail. It would still be an evil casual game, same with Wii Play and Wii Fit. Developer still decide Wii owners are "the wrong people", and still find ways to neglect the system. Modern Warfare would be an exception (since it actually was tech issues that kep the Wii engine from being done in time for the first MW game), but not because Infinity Ward would actually want to work on the Wii, but because Activision makes them.
A flashy-first game is awesome when it comes out. A great-first game is awesome forever.
Plus, just for the hell of it: Kelly Brook at the 2008 BAFTAs
