I'm still not convinced that NSMB Wii will boost sales that much over the short term.
Granted it wasn't holydays but Wii sales didn't spike that much when Mario kart Wii was released ( there was a notable hardware boost but it was spread over several months, maybe a whole year).
Granted over the long term the boost will be significant but the PS3 might be able to sneak to 5 millions before that....