NSMBW moved hardware, but not to the extent nintendo fans claim, holiday season, and the fact that for the first time wii was not supply constrained in the holidays were the main factors. If the wii hadn't been supply constrained in 08 it probably would have moved more hardware than in 09
This year will be the same in the holiday season wii will see massive sales again, not on the same level as last year, but still massive, mainly because its viewed as a great gift for young kids, and that nintendo is a brand that is viewed as very kid, and family friendly with games that are clearly targeted for younger audiences as opposed to the ps360 that mainly because of price and its library of games don't have the same connotation as the wii does
And that's what sony, but mainly microsoft, are gambling with there motion controls, its not to conquer us gamers, but to try and convince parents and relatives of young kids that there new devices are great gifts for there siblings. Some might say that the price is too high for kinect and move, but they are a novelty right now, and microsoft and sony know this, and because of that they know the early adopters will buy the devices at that price, and because of the holiday season sales will be inflated because of the shopping spree, and massive marketing but next year the prices will go down