However, I predict a steep drop and low weekly sales (fewer than 20K per week on average) into 2013. The lineup is dry going into the new year. I think the PS3 might even lead the Wii every now and then in the weekly sales, depending on what comes out in a particular week.
Agree. Unless NSMB just catches fire and/or Wii Fit repeats 2007, there is really no software coming out the first half to keep momentum.
Of course, Sony is doing a Nintendo a favor by giving them a year to sort things out and find its legs.