If Nintendo have learned their lesson they will not try and artificially inflate the Switches life, nor will they wait til it dies before introducing a successor. This will lead to second wave of sorts. Switch will continue to sell based off the casual market & people looking for a secondary console picking it up for its 5 or 8 major system sellers, meanwhile they should move their core audience onto next gen. I've been saying for a long time Switch 2 should come sooner than later (Fall 2021) and have period of cross gen.
That's a terrible, terrible idea, replacing one of the fastest selling systems in history after just 4 years. That'd be like replacing PS4 in 2017.
Bet with Liquidlaser: I say PS5 and Xbox Series will sell more than 56 million combined by the end of 2023.