What elements of next gen could the Switch's successor implement?

[Illusion]

I agree with the poster who said that we will get at least one "New 3DS" style refresh from the Switch. A major power bump while in docked mode would be welcome and it may be a fairly economical upgrade (maybe $100 for the new dock) for Switch users where the docked version could basically bring the Switch up to the level of XOne and PS4 graphics. This would keep the Switch relevant in attracting 3rd party support as developers are likely to still be supporting the PS4 and XOne for several more years with ports even after the new consoles launch.

New console sales of the switch should also start shipping with enhanced portable devices that can provide the higher graphics level both in docked mode and in portable. Older Switch users would be the ones who would need the enhanced dock and they would be dealing with a reduced graphics mode for newer games while on the go and maybe certain games cannot be played if the developers feel they cannot offered a downgraded graphics mode. It really isn't that much different from how Nintendo handled the Expansion Pak on the N64 as there were some games that required its use and many games just looked like garbage if you didn't have it.

I don't think that Nintendo should be in a rush to release a new console platform. The future is probably one where the days of having dedicated hardware sitting under your TV is coming to an end. With cloud computing and faster and faster mobile devices it won't be long before Nintendo can go the way that Disney has with Disney+ and start offering an online environment that people subscribe to for playing Nintendo games. All that people are going to need in the future is going to be a wireless controller and a smartphone/TV to play games. I think that this is where Nintendo should be looking for their next "generation" but that said, I do think that they can easily get another 4-5 years out of the Switch. They should milk this generation for as long as they can because I am not entirely confident in Nintendo's ability to avoid another Wii U disaster when launching a completely new concept.