The wii will be dead to Nintendo and developers by the end of 2013. There is no way it will sell 100 million, 50 million, hell even 15 million by then. Not happening, the wii is currently selling less than the PSP.
The wii u is around the corner, people have had their fill with the wii, they are moving on and so is Nintendo.
One of the reasons the wii dropped so bad compared to the ps2 end of gen is because Nintendo don't sell to as many countries as Sony did the ps2, Sony have loads of distributors.
So for Nintendo when the major western countries jump ship then the console suffers greatly. So the wii won't prosper as much as the ps2 did once the next gen begins.