Mario Kart 8 Deluxe already sold more than Mario Kart 8, Super Mario Kart, Mario Kart 64 and Double Dash

[tak13]

Miyamotoo said:

Talking about potential Mario Kart 9, with so great sales of MK8D Nintendo will not be in hurry to release MK9 on Switch, but would be great to see Diddy Kong Racing 2 in any case. :)

Obviously there is no reason for MK9 on NS, let Nintendo save it for the NS successor...