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
I always thought having some sort of eGPU in the dock would be nice. Enough to let it run games at higher resolution and frame rates on a large screen.
No idea how feasible that would actually be though.