It will sell over 10 million just because at this point Nintendo is going to have to bundle it to really boost Wii U sales, and just rely on people buying their other 1st party games to make a profit. MK7 has sold over 9 million, has never been bundled, on a console with only 27 percent of the install base of its previous version. A MK8 bundle release in April could sell 8 million Wii U's this year on its own, not to mention the copies sold to the base that already has a Wii U. I know that number seems high, but Nintendo has sold 1.3 million Wii U's since SM3DW's launch and that was the only AAA title released in a year. Stack the effects of Donkey Kong, Smash Bros, and all the other games coming soon along with a Mario Kart Bundle and I could easily see it beating Mario Kart 64 in a year.