I like all of them except the Switch Go, no ma'am 

Rumors have begun about a Nintendo Switch revision for late 2019....

https://mobile.twitter.com/WSJJapan/status/1047707384955768834

God I hope not. Next gen can't come soon enough.

Yes, this. This is exactly what I think about this statement. They will keep the Switch 1 as cheap option like they are keeping the 3DS currently. I can even see a successor as early as 2021, or more likely 2022, depending on how well the Switch sells after the next gen for the other companies starts.

And this here is the big point why most of the OP is not working. Currently we already have quite a lot of games that wouldn't work without detachable Joycons and a few that wouldn't work without the handheld mode. And this is without even considering Labo.

Think about it: a family thinks Go Vacation looks like a nice game. And hey, I get the base system for 100 bucks. Let's do that! Now they come home to realize they can't play Go Vacation, because the Joycons are integrated in the tablet in their version of Switch. They have to drop another 70 bucks for a pair of Joycons. Nintendo will not make this happening.

As XD84 is pointing out, Labo also fixes the size of the Switch tablet and the size of the Joycons. Currently Labo sits at 850K in VGC-tracking, without the third kit. So it will have around a million before the holidays. I think Labos future depends a bit on it's legs, so it should sell at least 300-400K over the holidays to be considered successful. But if it does that and Nintendo keeps on releasing new Labo kits, then I can't see Nintendo breaking compatibility with it.

So that leaves us with same base concept. But instead of reducing gameplay options with more models, Nintendo could expanding on it. That is in line with earlier consoles. DS had the DSi which added a camera. For Switch I could think of a dock that upscales to 4K, different controller options that fit into the Joycons slots (like the NES-controllers), a VR kit probably with a dock with additional hardware to add the processing power to keep things crisp in VR, 4G-support for the Switch tablet (and integrating the phone app in this version into the base Switch, so voice chat).

Exactly. It wouldn't be Switch without "switching". Whatever they'll do, the form factor / idea will stay the same.

That's my biggest worry when it comes to anyone's idea about a handheld or more powerful Switch. The Joy Cons, whether you like them or not, are an integral part of the Switch's identity. When you saw the first teaser of the console, you heard the clicking sound, which was made possible by the Joy Cons. It may sound like a dumb reason, but that's part of the Switch's marketing persona. When you hear that sound, you know its about the Nintendo Switch. Plus, the Joy Cons are what makes the Switch a versatile console. You can play multiplayer off the bat, play it on handheld mode, or attach it to the Joy Con grip and play on the TV. Plus, the various features such as HD rumble, IR pointer, NFC reader, and motion controls add to the capabilities of the Switch.

I know some don't like the Joy Cons, but you can't just simply replace them for the next iteration of the Switch. Various games utilize the features of the Joy Cons and to just put them aside could affect how those particular games are played. Whether its Labo, 1-2 Switch, Super Mario Party, Splatoon 2, ARMS, and the upcoming Pokemon Let's Go games, there are games out there on Switch that utilize the Joy Con features.

Some very bad form factors to play on those shots. But yes it's possible that they will double their gen with some different models.

About crazy designs, I though about one that would be the complete portable version of switch.
Switch, by definition, have to change the way you play, so a portable only version would not have this feature in the name definition.

So, I thought in a device that merges switch, 3DS and mobile, where you can switch between the modes. So, you have the switch between modes to keep the definition of the name of the console.

Is a sliding screen (like your switch go), but there is a screen in the part below, and it would have a 3DS cartridge slot and play 3DS games in this mode.

Then you could detach the controllers (mini joycons) and put in the top screen and slide the below screen, and then you can play switch games.

If you close it with controllers in the below screen, you play the mobile mode, where all nintendo mobile games are there playable.

...So, Nintendo Switch Lite is in FACT launching late 2019 for $199; and they called it a new addition to the Family.

Maybe a Nintendo Switch with a larger screen in 2020 could happen afterall.

:P

Larger Screen Nintendo Switch is finally happening. A year late, but a lot of stuff did get delayed...

Will be interesting to see how much more of this old prediction will play out.

I think a VitaTV-like Nintendo Switch is the most likely next model, and software for 2022 is looking decent as well.