500k sales should be doable, although it would have been easier without NSMB U on the market.
And no matter what happens, I think Ubisoft will end porting it to other platforms.
Please excuse my bad English.
Currently gaming on a PC with an i5-4670k@stock (for now), 16Gb RAM 1600 MHz and a GTX 1070
Steam / Live / NNID : jonxiquet Add me if you want, but I'm a single player gamer.