This is a weird one, but I’d love to see a reimplementation of the sensor bar. The gyro controls haven’t cut it for me. I like how the Wii U game pad had the sensor bar built in to the bezel. The real engineering nightmare would be squeezing IR cameras into the top of the Joycon
Sounds like a latency nightmare.
They did a good job with Wii U’s latency. The only thing that was shit was its range, which wouldn’t be a big deal because you’d only want to stream to the TV if you were in the same room as it. Ideally it’d be a dock that you can physically put the console in or stream to it.
Wireless transmission latency is good enough for pc players connecting to oculus headsets. Besides, if this is just a wishlist, I would hope that nintendo keeps traditional docking as well if you are playing a latency critical game or want to use a pro controller instead of the console itself as the controller.