I agree with this, to a certain degree. I enjoy the mario spin-offs and what -not, but it seems like the Wii is being flooded with them. I say, keep the Mario games coming, but maybe once a year, make an original Mario game. Super Smash Bros was a breath of fresh air, even if mario only made a cameo appearance.
Seeing more original games would be awesome, Nintendo has the man power and the wits to pull am awesome original game off. I say, take a leaf outta Sega's book, From Virtua Fighter to Sonic. Nintendo should stop making as many buddy games, and cater for the mature side of the Wii owner. Make a Virtua Fighter, Halo or DMC type game... GO FOR IT!