Of the 3 consoles, the Wii is hardest to guess, and probably will be until supply > demand. When that will happen is anyone's guess. But until that DOES happen, all we're doing is throwing around theories with incredibly little basis, at least in regards to sales numbers. There are enough wii-haters to let us know when they start appearing in stores regularly, that's for sure. And I mean some kind of evidence, not just a few random people saying wii-are-doomed. :-/
Nobody is crazy enough to accuse me of being sane.