My guess is Nintendo will do this ... regular Switch model is phased out entirely in 2024, Switch OLED is dropped to $299.99 but production of this model is heavily reduced (like the PS4). Switch Lite remains at $199.99 with maybe things like Black Friday promos at $169.99 once a year.
They are going to want to push people into buying a Switch 2 instead rather than letting the existing Switch models really undercut that I think, like Switch 1 will be something that there's as a fall back option but not something Nintendo will push aggressively (same way Sony treats the PS4 hardware ... if you really want one, you can get one, but Sony is not really doing much to encourage it and trying to channel people to the PS5).