I can definitely see Nintendo rolling with the home console-handheld-hybrid concept (while maybe also tacking on a new feature each gen), but I don't really see them running with the Switch name except maybe for one more gen. Nintendo is known for going in new directions with both their console and branding most of the time.
It does not need to have the same name so much as keep the hybrid concept alive with full backwards compatibility to all the way back to the current Switch. If they added an extra feature that would only be usable on the newer model, the name can help showcase that.
The key points are hybrid concept, full BC with eshop included, hardware cycling, and hardware design at its core. Most innovating will likely be done in similar fashion to Labo or Ring Fit at this point. So in that respect, it can still be part of a Switch "family" without being called a Switch in name itself.