I think the Switch is a bit of an entrance system, and it won't receive a traditional style successor, but instead compelling (which will probably include power boosts) upgrades, perhaps in new form factors: Switch Mini, Switch XL, that sort of thing. Maybe even a dock with a built-in processor for massively increased power in console mode; there were some hints to this before launch.
Pokemon could pair up well with a Switch Mini.
The reason I suggest this is that the tech is very future proof. Nvidia hardware can be upgraded while maintaining iterations of the Switch software Platform. I don't know if Nintendo would have gone with the Tegra architecture if upgrading and spreading to different form factors was not on in the plans.
What I think occurred with the Switch is that they were developing a base console for which they could begin collecting a back catalogue for future consoles. They planned it out very well like the Wii's first three years, only this time there's a much brighter future ahead due to the versatility of the technology, and development on the Nvidia end.
I describe myself as a little dose of toxic masculinity.
