How much would Mario Kart 9 sell lifetime if its multiplat?

[JNK]

Release late 2017 on Ps4, Xbox One, WiiU/NX and PC.

Same content as usual (32 tracks, ~15 drivers and co).

 

keep in mind: Mario Kart Wii - 33 Mio sold exclusivly on Wii, but got heavily bundled.

Mario Kart 8: Sold 6,5 Mio on 12 Mio installed HW Base (more then 50% attachment rate)