LOL why don't they make a Grand Theft Mario? Killing Toads, stealing karts and deal about drugs with Bowser!
When I first saw your thread, I agreed completely with you, but not in the way you are thinking. What Nintendo has to do is now to improve further Mario platforming, real Mario's roots, change the formula somewhere and create brand new loveable characters like they did so well with Yoshi in SMW or Bowsy in Sunshine.
"Seriously Nintendo, no serious gamers want a Wii, if you want our loveable Mario to survive, please unleash his future games on real consoles."
Mario has never been so well in shape than on the Wii. I don't think he struggles to survive right now, with Mario Kart Wii sales of 21 million, Brawl with 9.5 million, Galaxy with 8.5 M, NSMBW with 11.5 M.
He will survive of course, but not by going multiplatform. Then he would die like Rare did by going with MS. Mario doesn't appeal to Xbox FPS lovers.