One reason the NS will continue to sell well:
Look at the game lineup it already has after 3 years:
Best in class Open World - BotW
Best in class Platforming - Mario Odyssey
Best in class Racing - Mario Kart 8 Deluxe
Best in class Fighting - Smash Bros
Biggest Brand in the world - Pokemon
Best game to play in a pandemic - Animal Crossing
Best game to keep in shape during a pandemic - Ring Fit Adventure
Best party games, best couch co-op gaming, and on and on...
Anyone thinking that this pandemic hasn't changed what people seek in video games for at least the next few years (time killers, fitness, etc) is really going to be surprised when the Switch has 3 straight years of 20+ million units sold and potentially 4. Let's also not forget that the real possibility of an economic depression worldwide will have many looking for the cheapest versions of entertainment possible and the Switch will handily win that between a cheaper console and a great lineup of games to dive into.
If Nintendo can keep production up on hardware and Ring Fit Adventure prepare to see another huge seller for them.
Nintendo with the Switch:







