I'm frankly shocked at all the people who somehow believe that Wii sales will be dropping again after a mere 4 days of a lower price.. Come on people use your head. Why the hell would a seemingly rational company cut $50 off their console for a mere one week increase? I mean I still stand by what I said about the Wii price drop being a dumb move, but it's not THAT dumb!
Those who point to the PS3 for evidence of a fast drop, the PS3 had a new model which boosted sales to greater heights than there would have been had there been ONLY a price drop, so of course the dropoff will be larger, because the initial spike was also larger from the new model.
I think next week will be a virtual tie between the PS3 and Wii with Wii maybe having a slight edge. After that it'll be a matter of what moves more consoles, FFXIII or NSMB Wii, but I'm about 90% sure a 2-D Mario game is more popular and will drive more sales than FFXIII. Plus, Nintendo tends to have abnormally large holiday boosts (probably from all the parents waiting to buy Nintendo products for their children).