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.
Necro-bump this 2020: http://gamrconnect.vgchartz.com/thread.php?id=229249
Bumb in 2021: http://gamrconnect.vgchartz.com/post.php?id=9047071