I think SMM2 will top 8-9M. I still don't see more than 9 ten millions sellers for the Switch and the only one which could be the 10th is a new Super Mario Kart.
Remember also that Majora's Mask had the same quality orverall as Ocarina, but sold twice less.
Also I live in a world where I believe that the Switch won't reach 75M because it will be replaced in 2021 by the 9th gen Nintendo hybrid next console.







