I imagine it would be a better tablet, hopefully it would also have complete backward compatibility. Edit: I see there are a lot of replies already on my comment but I need to add more thoughts to it, I have the feeling that if Nintendo is going to release a better tablet with complete backward compatibility with the Switch, most developers will continue to develop for the original console instead of developing games…
I feel like they pretty much have to make it backwards compatible. They just released a new Zelda game which is like a once-every-7-years event and there's no way they're gonna make people re-buy the game a year after launch on the new console, especially when they already made it the most expensive single price for a Switch game. Plus they have a fairly big Mario release coming up next month (Super Mario Bros Wonder…
N64, good sales, but not great. NES and SNES were better.
GameCube, total meltdown (for the time).
Wii, excellent sales.
Wii U, total meltdown.
Switch, excellent sales.
Switch 2, anything but a meltdown.