Wii has reached saturation and is now "normal" sales, which is still > 360 sales. Wii will still be extremely strong this holiday season. I think it will have trouble beating PS3 + 360 sales combined most weeks, but it will stay on top most weeks.
Lower price of 360 helps it's sales a lot as a second console. I mean, at $129 with a 20gb hard drive how could I not pick it up, even though I would have preferred a PS3.