So, back in the day when Mario Kart 8 was about to launch, this question would sound a bit too crazy considering Wii U's low userbase... but since then the game surprised us all with a crazy attach rate above 50%. The game is at 6.55m right now and the year still hasn't ended technically; while Super Mario Kart stands at 8.76m.
So... considering these things, do you think this is possible or is it pushing too far?
UPDATE: According to Nintendo, the game is at 7.24m (12/31/2015). It only needs to sell 1,53m to surpass Super Mario Kart's sales.
UPDATE 2: According to Nintendo, the game is at 7.5m (03/31/2016). It only needs to sell 1,27m to surpass Super Mario Karts's sales.
Bet with Teeqoz for 2 weeks of avatar and sig control that Super Mario Odyssey would ship more than 7m on its first 2 months. The game shipped 9.07m, so I won