Tough question. Well I agree with whoever said the wii woudn't exist without mario but hypothetically, I think it wouldn't sell that great. Maybe a million.
It would still be a great game, but the idea of a plumber in outer space jumping on enemies to save a princess would sound pretty ridiculous. And the name Mario would mean nothing to people.
Also I should mention if it was the first in the series no way it would score a 97 on Metacritic, it would get way lower even though its the same game.
Owner of 360
Future owner of a PS3 (when it drops to $300)