Zelda is well on its way there already.
3D Mario has passed the 10m mark before with 64 and Galaxy, and Odyssey as a spiritual successor to 64 will do the same. Like Zelda, it will be an evergreen title for the system that will continue to sell throughout the Switch's life.
Splatoon sold 5 million as an unproven new IP on a system that didn't even reach 14 million. Now that it's a proven and beloved brand, and has a much more successful platform to sell on, it will double that.
This is my typically pessimistic prediction. Do you agree with me, or do you think I'm not being pessimistic enough?
Bet with Liquidlaser: I say PS5 and Xbox Series will sell more than 56 million combined by the end of 2023.