Power-wise I'm thinking PS4 Pro level power. 1080p screen. 4k capable when docked. Hopefully a small enough gap from the other next gen systems to get more support from 3rd party graphically downgraded but still good AAA games than Switch.
^ that cannot be done with todays technology....
I think maybe you can get a Switch 2, thats around where the Base PS4 is (when docked).
That could probably be possible in 2021.
That would mean Switch 1 -> Switch 2, is a jump of x3-4 times in terms of power.
My, I can't even begin here. For starters, we're talking about something coming 3 years from now. Today's technology being irrelevant. A system like the switch could have released last month while already being more powerful than a ps4. And no, the gap between the switch and ps4 isn't 3-4x, more like 2-2.25.