I already have a Switch to play Switch games on, so BC offers no value to me.
I keep all my older consoles and still revisit my Wii U, PS3, and 360 sometimes, so I have no doubt I'll still be using my Switch years after it is replaced.
If/when I buy the next system, it will to play actual new games I can't get on the current hardware.
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)