Another reason why i'm hoping for a Wreck it ralph world.I would actually buy a "Kingdom Karts" game solely because of the potential comedy value, although I'd certainly beg Nomura to not bend over backwards to try and make it yet again somehow canon and connected to the rest of the series and the overaching story.
Rumble Racing in BBS practically is a "poor man's Kingdom Karts" already (albeit with a shitty enemy driver AI and somewhat sloppy control scheme) so one could expand outwards from this.
Improved kart racing?Yes please.