Let’s speculate! Several manufacturers have approached Nintendo about producing the Wii’s accelerometer, presumably for less money than current suppliers do. So, a cheaper accelerometer means a cheaper Wii, right?
We need to face the facts that Nintendo is currently selling as many Wiis as it can ship. (It sold 800,000 Thanksgiving week alone, as Sony and Microsoft fought for the scraps.) Since it clearly doesn’t need to cut the price of the Wii, why should it?