I find this a bit difficult to answer because I feel like certain games maybe should be held off for the next system for a variety of reasons. That said...
Wave Race, for sure. Takahashi's comments got my hopes up and I'm a little disappointed that nothing has materialized so far. I still go back to the original on N64 because it's such a perfect little game that I wouldn't mind if we just got a "Wave Race 64 Deluxe" with better graphics, water physics, new and remixed music, bigger dolphin park as well as additional tracks and racers.
Of course, I'm also the person that keeps posting this gif:
so I wouldn't mind waiting for it a little bit longer...