The Switch is turning six years old next year, which is the normal lifespan of a Nintendo console, but Kimishima and Miyamoto both said that they wanted the Switch to have a longer lifespan then their other consoles back in 2018:
https://nintendosoup.com/nintendo-wants-extend-switchs-lifespan-6-years/
https://www.techtimes.com/articles/220861/20180213/shigeru-miyamoto-says-you-should-look-forward-to-a-longer-nintendo-switch-life-cycle.htm
That and the fact that they are releasing high profile releases like Splatoon 3 and BOTW2 this year, makes me think that Switch 2 won't come out before at least 2024.
What do you guys think?