Nintendo will be under pressure for next-gen hardware from mismatch to performance against other consoles
No, they won't.
The Switch audience, especially in Japan, doesn't care about it being graphically competitive. It won't suffer from this any more than DS suffered from being massively less powerful than PS3/360.
Bet with Liquidlaser: I say PS5 and Xbox Series will sell more than 56 million combined by the end of 2023. (And over 130 million lifetime)