Ever since the N64, the sales of Nintendo handhelds have been significantly higher then the consoles (with the exception of the Wii and DS)
Seriously, look
SNES: 50m
N64: 32m, GB+GBC: 118m
GC: 22m, GBA: 88m
WiiU: 6m, 3DS: 44m
It would be intresting if they made handheld exclusives but have Mario and other Nintendo games on consoles
I really would not care if they did