I've predicted 22 Million lifetime but I'm starting to think that may be too low for this title.. NSMBWii will be a huge hardware mover.
Most of my points have already been made in this thread but I see it basically taking over from Mario Kart Wii while both Wii Sports Resort and Wii Fit Plus take over from Wii Fit. They will continuously move hardware throughout 2010 and it'll be observable as their sales numbers will seem tied to the sales numbers of the Wii console itself.







