Wii already peaked in Japan and I doubt any software will allow it to reach its previous peak..
Wii sold less units the year MK, SSBB and the first full year of Wii Fit than it did the year it was sold out everywhere ( or for those that don't follow 2008 Wii sales < 2007 Wii sales).
The only question is how much weaker 2009 sales will be compared to 2008 and if the slide is going to keep going in 2010...
If 2009 ends up being only 20% or less lower than 2008 I think things will good, if sales end up dropping by 50% Nintendo will be in trouble in the home turf( but sales dropping by 50% is doubtfull, they can't have worse release titles for holyday 2009 than they did for holyday 2008 ( in term of those titles boosting hardware I mean, AC and Wii music were fines but I didn't feel they were titles that would convince customers not owning a Wii to make the jump and purchase one)).
PS3-Xbox360 gap : 1.5 millions and going up in PS3 favor !
PS3-Wii gap : 20 millions and going down !
