It would take literal magic to have a functioning handheld with that level of power.
Well not the handheld part... but docked mode could be possible. I'm thinking its
possible to pull a Xavier with 500 GFLOPs handheld and 1.3 TFLOPs docked in GPU power on paper at the most. 1.3 TFLOP console with 8GB of RAM, A72 core CPU, +130 GB/s bandwidth, could have it punch above xbone base specs in GPU power, and get pretty close to PS4 maybe. If they do upgrade the hybrid specs, I think we'd get a minimum of 1.5x minimum power, which would be X2 territory. So next hybrid tech upgrade could be anywhere between 600 GLOPs to 1.3 TFLOPs. I'm not expecting a 1080p screen, even if its a 500 GFLOP console and could run current 900p swich games at 1080p.. That kind of resolution takes 2.2x more processing power than 720p and it would eat up battery. I'm thinking for xavier, we'd have to get a node down at least to 10nm.
Who knows... Remember when we thought the Switch would have X2 specs and that didn't happen? This is Nintendo we're talking about. We could get a switch with a better screen and smaller bezels with the same power, but a stand alone dedicated console that is as powerful as a PS4 Pro by end of 2020 for all we know.