I'm thinking no. Mario Kart games are mostly identical from one to the other with a few changed up mechanics. That's why they only do one per console. Otherwise, they'd be releasing multiple near-identical games with different stages, which they might as well add through DLC. But perhaps, not having to focus on a new Mario Kart will allow them to develop some of their other IPs or even create brand new ones. Mario Kart 8 Deluxe is plenty great already.
That said, I really would like a new Mario Kart. I bought MK8 on Wii U and didn't rebuy on Switch because I had already played the Wii U version to death. I do like me some Mario Kart, and it'd be a shame if there wasn't a new one with new stages and things for their next console. That's my two cents on this topic.