The successor to Nintendo Switch named Switch 2 will continue to be a hybrid console that can be played on TV and in portable mode, it will be launched without an OLED screen (it will have an LCD) and it will have cartridges/cards for physical games , according to various sources. Anonymous to VGC, where they say that the device is “likely” to hit stores in the second half of 2024. They add that there are already development studios outside the Japanese company with the development kit.
It would be interesting if they made the jump to x86, but in addition to what you mentioned, I don’t think they’d go for it due to the extra power and thermal requirements. I think people would bash on Nintendo if the Switch 2 was way beefier in form factor compared to the Switch 1.