The existence of the XSS has zero, or close to zero, effect on what stuff gets ported to Switch/2. The biggest difficulty when porting to the Switch/2 isn't downscaling assets/models for the lower tier hardware, it's porting the game to ARM. Even if the game engine has support for ARM(Not a guarantee for most AAA titles unless they're running on Unreal), the optimisations done to get the game running smoothly would most likely need to be redone as well, due to the changes from x86 to ARM.
Theoretically the Switch 2 could be running an x86 processor, but that makes no sense given how much more power efficient ARM is.