1)depends on how many units were shipped.you can't sell more than you have.
2)the prize is to high for the usual nintendo gamer who wants some fun for little money
3)the hardware is to weak for the usual core gamer who was tortured since the DS/3ds/wii with low standard graphics by nintendo and who is no longer willing to buy nintendo stuff as long as nintendo does not change their low tech agenda.And as long as there is no 3dmario or zelda there is no reason to buy the Wii u and as long as all known wii u exclusives don't even come close to look like uncharted or gow few units will be sold.
4)the casual gamer has recently bought a 2dmario game for 3ds and is a little bit tired and bored by yet another mario.
5)many uninformed casual gamers.I've been yesterday on german amazon for layton/3ds and was wondering why the avarage rating was so bad(4.0)I can't remember the exact numbers,but around 20 voted 5stars,10 four stars,no 3 or 2 stars,but around 12 one star rating.All one star raters were complaining that the game does not work the old ds handheld.This means 1/4 of the ds owners have absolutely no idea about hardware.the same with the Wii u.
6)the wii u pro controller does not work with nintendoland and mario.that's the most stupid thing i've ever heard.you buy a second controller to play multiplayer games because the tablett is not available,you've sold your wii to buy a wii u and you can't play multiplayer.
7)my best gaming experience was with the n64,great games like mario,zelda,KI,1080,wave racer etcetc,but since than nintendo is getting worser and worser.no new franchises for core gamers,no old franchises for core gamers(f zero,wave racer)just two great mario galaxies and metroids,one great donkey kong,ugly zeldas and recycled,cheaply fast build 2d marios made with a little big planet-like editor.I'm no longer willing to pay for this onegood game per year company.Instead of creating new IP's they are paying for monster hunter and dragon quest to become exclusives and I have to play those ugly nintendo versions that still look like ps2 games.(and i bet the new mario 3d and zelda won't look better than a middle class ps360 game)
Nintendo has to rethink their strategy in several ways .thanks for nothing nintendo.