Only 3.77m which isn't that ridiculous. Actually if you count MHW and it's inevitable "Super Ultra Plus Edition" re-release together it will more than likely beat that. Less likely it can do it without a "Super Ultra Plus Edition", but it's not impossible by any means.
Wii Fit and Wii Fit+ are 6M+. Wii Sports and Resort are 7M+.
Don't Play Stationary 4 ever. Switch!