Next-Gen consoles will have the novelty of new hardware on their side. But the Switch can still hold its own so long as Nintendo continues with good software. Content is ultimately what matters at the end of the day.
New hardware, specifically hardware that is a new console generation, isn't a novelty. Never has been.
Because Sony/MS basically get near 99% of third party titles, the "content" isn't really ever a problem for them. PS5 will have hundreds of good games, that's the benefit you get from being the no.1 platform for hundreds of devs all over the world.