I didn't watch the video but I'll still speculate.

A Tegra X2 based Switch will likely happen, for the sake of improving battery life.

Perhaps a "Switch Pro" where it's only a home box (compatible with grip joy cons and pro controller). Maybe Tegra X3 based, 1080p+ across the board.

That's just a given when you are taking hardware off the shelf.
If it was a custom chip, then such iterative upgrades do tend to get a little more difficult.

PC, PS4, Xbox One say otherwise.

Sure there will be people who don't care about power, but there are plenty of people who do care about power.
Just like there are people who love The Last of Us... And other people who can't stand it. Not everyone likes/dislikes the same thing we are all different.

I disagree. 720P is terrible on a 6" panel. It's more acceptable on a 4" screen... Even then I would still want more.

Besides, Switch is NOT using the most efficient display anyway, there have been plenty of prior examples where a newer, higher resolution, brighter display has consumed LESS energy than the older panel.
The Switch is also not using the most efficient SoC, it's not even using the most energy dense battery. There are gains to be had everywhere, but they do tend to cost.

I ideally wanted the Switch to have an 8-9" screen with a 1440P AMOLED or better panel, it's 2017, 720P looks like shit.

If Nintendo can deliver the goods with a Switch successor/update, I'll be onboard. They lost me when they revealed the specs initiatlly for the Switch, I'm a hardware enthusiast and expect more for my dollar.

Just make a Pro/Scorpio version of the Switch and ill be happy. My TV begs for it.

Sorry but I think you're being shortsighted and not completely honest with yourself.  You would not have Breath of The Wild (as it is) on the Wii or 3DS hardware, you needed POWER for that. Plain and simple.

Does there being a new model of the Switch actively harm your experience with your current device.
Why do you care if people have the option. the choice to buy something better than what they have now.

I care if there's games for it that my Switch can't play.

Well. As a consumer, I don't need to worry about it from a business perspective.
And consumers should always expect more from companies, not less, we don't owe businesses anything... But they do have to fight for our dollar.
Valve, Microsoft, Sony, Nintendo... They make Billions from licensing. They can afford to spend a few bucks extra.

As long as they look well and they are engaging to play most people doesn't care about how advanced the tech behind is, BoTW is running on a WiiU which is supposed to be close to Ps3/X360, I didn't need a powerhouse to play one of the best videogames ever done. Better tech is great, but at what cost? should Switch be way more powerful and cost 500$ just so the tech enthusiasts are happy but nobody else buy it? No it shouldn't, the console is impressive enough as it is, every single person I have seen experiencing the Switch for the first time have a similar reaction, a very good one, games look beyond awesome for a handheld, and at this level they look good enough on a TV (games like MK8D or Arms are good prove of that) so that's everything that matters in that regard, people doesn't care if you are using subsurface scattering on Link's skin.

For sure we will see incremental improvements to switch. With tegra x2 we will get more battery life and also more storage and better built quality.

Switch has a great future ahead.

More hardware models mean more money. 

It also encourages more hardware double (and triple) dippers. 

You think Apple sells 200+ million smartphones a year if they only offered the same iPhone model for 3-4 years at a time? 

The better question is what about the "old way" is better ... it's not the 1980s anymore, hardware evolves at a faster rate for everyone, and there's plenty of financial motivation to do so. 

The old model exists as such because the industry was focused on 9-year-old boys then who couldn't afford a new piece of game hardware every 3-4 years, the market is so far beyond that today it's not even funny. 

Business wise having more hardware models with more incentive (meaning not just cosmetic difference) to rebuy = more net money. That's how it is in electronics period today. 

Beyond that the Switch could definitely use a larger screen, not only is that bezel a giant waste, but the system would be far more usable in table top mode with multiple people gathered around if it had a 7-8 inch display, but your pixel density decreases if you don't up your resolution.