Slarvax on 27 March 2017
Easy answer is Mario, of course. Though it's hard to tell how well Spla2n will do. Like others have pointed out, online play being behind a paywall might hurt it (specially because it starts free and then they will ask you to pay. Some will get mad, bla bla), but this is also the first Splatoon to be portable.
Odyssey should easily sell past 3D World, it could even reach over 10 million units. Spla2n is more of a gamble. It could also reach 10 million, but I'll be safe and say it'll sell a maximum of 8 million units.
Bet with bluedawgs: I say Switch will outsell PS4 in 2018, he says PS4 will outsell Switch. He's now permabanned, but the bet will remain in my sig.
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