I've thought of a Switch 2/Pro/U gimmick I'd actually care about. I nearly posted this in the hardware spec thread, but it's too much of a tangent from figuring out as much as possible about Dane.
The question of whether The Next Console Iteration will have a control gimmick, with the general consensus being that no one wants one. I realize I'm gonna get some shit for this but you know what I would really welcome? Wii Style Pointer Controls.
The Switch has an amazing trick with the Joy-Cons + The Touchscreen. Touch allows pointer centric games to run in portable mode (sometimes awkwardly, ala Mario Galaxy) and pointer emulation with accelerometers does an admirable job with emulating a Wii pointer.
But the Wii generation is about to be in their Nostalgic Feels, and the pointer emulation limits a lot of the Wii library from coming over comfortably. On the other hand, touchscreen gaming is going strong in the mobile world and PCs still have a mouse - getting those games up onto the TV is a challenge.
I think there would be real value in bringing a Wii style pointer back - especially if it can be made sensor-bar-less. Weirdly enough, I have a tiny bit of experience with that. Back in the aughts I worked in a psych lab that used IR cameras for eye tracking. I did some experiments with CRTs, and you can absolutely see a TV as a square of light with an IR camera like the one in the Joy-Con, and with some processing power use it to orient a pointer just like a sensor-bar. I have no sense of whether that technique would work with modern TVs (it's probably a no go on OLEDs), and I think the ergonomics to put a camera on the front of the Joy-Con would be a nightmare. BUT - I didn't have a Wii so I want it, nyah nyah