We'll pretend Nintendo cancels the Wii at the one-year anniversary of the Wii U's release. And we'll assume they release the Wii U in mid November this year.
Going with your assumption that after Wii U releases it'll average 25k a week, for the one year afterwards, it'll have 1,300,000 sales.
Now, we'll pretend it averages 75,000 a week until Wii U releases. That's 2,400,000 sales.
Together that's 3,700,000 sales. That's with rather conservative estimates, and that's completely ignoring any possible sales bumps, including those caused by one or two more price cuts and a holiday season. I find it extremely possible that it'll be able to scrape up that last 1,100,000 sales.
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