How many million sellers will Wii U have in the end?

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I'm gonna say 15-20.
As has been stated, already released games like Hyrule Warriors, Pikmin 3, LEGO City, Mario Party 10, and Captain Toad should make it, and a number of upcoming releases have a shot as well, like Yoshi's Woolly World, XCX, and Splatoon. Zelda is a lock. They'll likely be unannounced games like will make it too.