I know many will hate me because this (or hate me more), but right now people interested in Mario has a bundle with NSMBU and NSLU. Why would they want another Mario that looks and plays similar to those ones?
There's no need to buy another one. Maybe the 3D Mario I speculate can give a different impression and be enough different for people to buy it.
Proud to be the first cool Nintendo fan ever
Number ONE Zelda fan in the Universe
Prediction: No Zelda HD for Wii U, quietly moved to the succesor
Predictions for Nintendo NX and Mobile