With the Wave Race series being shelved for nearly two decades, along with plenty of other Nintendo IPs, it wouldn't surprise me to learn if the success of Switch has Nintendo looking over which of their old IPs to revitalize next for that sweet, sweet portability factor.
For many, I'm sure, a new Wave Race is high on the wish list and small tidbits of information over the years have kept their hopes up. That said, it would appear the producer of the series, Shinya Takahashi, wants you to keep doing exactly that!
via destructoid https://www.destructoid.com/wave-race-producer-teases-the-possibility-of-a-return-on-nintendo-switch-499153.phtml