At least Wii will get 6 years of life, maybe as much as 8 years. And the sucsessor will be out before Wii turns 7.
I will be happy if Wii gets to 50 million.
Not like I say Wii won't get to over 100 million or higher, but I want to see Wii at 40 plus million before and have a look at the console trends at the time.