Mnementh on 20 January 2021
Well, we currently expect Switch to peak in 2020 or 2021. Which would mean the sales would go down over the coming years, as Switch hits saturation. So it seems unlikely. As others said, a possibility is an early launch of the next-gen, which seems unlikely even if PS5 and Series fail.
But, there is some historical precedence for an elongated lifetime. The Gameboy. The reasons for the Gameboys long lifetime are Gameboy Color and Pokemon. So there is a chance, if Nintendo releases a Switch model everyone wants because of some feature (not more power, but something like color over black and white) which everyone wants. And/Or a new game that catches on fire and brings a completely new audience into gaming.
That seems unlikely, but possible.
