Nintendo has made it clear that they aren't planning to make a revised version of the Switch any time soon. That said, they still love to find new ways for people to use the console, with their Nintendo Labo initiative being a recent example. If they want literally everyone on Earth to buy a Switch, they are going to have to keep coming up with new angles to grab headlines and draw in new players.
They also have to keep old customers, which certainly hasn't been a problem for them so far, but there may come a time when Switch owners start to miss the perks of Nintendo consoles past. Many of us are already wistful for the smaller form factor of the Gameboy and DS line of handhelds, and second screen gameplay mechanics that both the Wii U and 3DS had to offer. As much as I love Splatoon 2, the loss of the option for pin-point map hopping on the Wii U Gamepad screen makes it ever so slightly inferior to the original, at least in that regard.
Artist and designer Eric Kubli has proposed a way to fix those problems.
via destructoid https://www.destructoid.com/would-you-buy-a-switch-joy-con-that-has-its-own-screen--492729.phtml