This is an argument that's been ongoing on Twitter over the course of several days. Mario Kart 8 has dipped into the idea of making characters from other series playable, and I would imagine this is going to continue into the next full Mario Kart game. The crossover characters were all very well-received, and they doubled down on this by adding even more to 8 Deluxe. A recent article claiming that the next Mario Kart game is in the works has prompted some people to share their opinion that Nintendo should go all-in on the idea and make Nintendo Kart. Others, however, would prefer if they stuck to what Mario Kart 8 did, maybe adding a few more crossover characters but sticking mainly to the Mario branding. Do note that people who want Nintendo Kart mainly hope to see racetracks from other series' locations as well. Which would you prefer? I'm curious to hear what you guys think, please be as elaborate as you'd like.