Technology advances quickly. In 2010 nobody would have guessed a portable console able to play advanced console/PC games in 1080p, 30fps for $300 in less than a decade out.

A 4K capable Switch in a couple years is definitely possible. I think the Switch will have more iterations than the 3DS. A Switch Mini, Switch Pro, and then eventually a Switch 2 in 4 to 5 years. A powered dock that enhances the power of the Switch more than now is also possible.

1080p is a 2k resolution.

I mean... the Vita launched the next year in 2011 and wasn't that far off. I don't think it was that unimaginable, also the switch doesn't play at 1080p as a "portable console", it has trouble running "advanced console/pc games" in 1080p docked.

I think Nintendo should just run with Nvidia's chips and the Switch hardware design. It works wonders and offers something the other consoles don't. They've created their own niche again for a 1st party hardware and software developer. Just give us a Switch 2 with more power. That being said, I think the Switch will be around for about 8-10 years so we've got a while before the successor.

The Switch will be a laughing stock in 8 years time. I expect a more powerful Switch model before the end of 2020, or a successor by march 2022. I don't see the Switch as a long-lasting device at all, it's not designed to be. Without serious revisions (not just form-factor) it'll last 5 years before it's replaced.

If the PS3 can last 8-10 years so can the Switch. It's going to get much more support due to the combination of console and handheld development teams. There's still a ton of games that we know and don't know that could fill this time. It's' not about power or form factor. It's about the games. And I don't mean it'll be the main console for 10 years. Sure the Switch 2 could have launched in that time but Switch itself will probably still be supported if the market is there. The same way how a lot of developers still supported the PS3 even though the PS4 had been out for years.

Switch Lite will definitely be a thing

Is that a problem? If it isn't broke don't fix it. Nintendo doesn't need to try to "innovate" just to make a successful platform. Look at Sony and Microsoft. They literally release new hardware that just has a faster CPU and more Ram and they sell pretty well. Of course Nintendo will find a way to add flare to the device but it doesn't need to be a groundbreaking idea. Take DS to 3DS as well. 3DS was just an upgraded DS. What matters more than anything is the software support. We get so hung up on hardware when it's just the catalyst for software which actually matters. 

HDR yes.

4K why?

^ this.

Kinda like the "new 3ds" have abit more juice (but not much), so it ll more often do 1080p instead of 900p.

I could see a "switch XL" or whatever revision come out like next year or so.

Not necessarily. Wii U had a myriad of issues that destroyed its success. The name of course, hardware, marketing, and software. The Switch has nailed almost all of these and selling a successor should be simple if you have the games. Sony could have had the PS3 look exactly like the PS2 and it still would have sold because of the name alone means progress. PS2--PS3. With Wii...what's a Wii U? A U? Is that even quantifiable? That's how consumers react to something like that. I think it's fair to say Wii U was a half baked Switch and nintendo just needed the hardware to make it happen and Nvidia and their mobile chips solved this issue. Nvidia and Nintendo have a multi decade partnership, I doubt they're not going to take advantage of the mobile chips.

What Nintendo has in their hands is the infancy of the future of gaming. They just need to nurture and grow it.