I think that Nintendo will be interested in making their hardware more compact, providing they can still squeeze in tech that's equivalent to the PS4 Pro or something. I think they might actually experiment with folding screens - so you have a device that can be used like a standard switch, but then you can partial fold it and attach the controllers in portrait mode to play 3DS style games. Could probably fully fold it to make it more portable, but that depends on a solution for the protruding joysticks.