That's way too far down the line and far too many factors to consider to even begin to predict. If Nintendo plays it smart and keep the supply lines of games going, and hopefuly push third parties to do so as well, unlike in the latter years of the Wii, then I see no reason why the Wii U shouldn't get at least 80 million in sales. Especially when you consider the hit games Wii U is getting right off the bat in NSMB U, Dragon Quest, Monster Hunter, Wii Fit, and Call of Duty. But 100 million is a long shot, and IMO will require a few new surprise hit "lighning in a bottle" type games like Wii Sports and Fit were.
I've said it before and I'll say it again, this gen is Nintendo's to f-up. As long as they don't, I see a pretty bright future for the Wii U. Though you never known with Nintendo. They could get too complacent and too sure of themselves, and begin to rest on their laurels. They're already showing signs of that already. And as we've learned from Sony, that can lead to big problems.
