The Nintendo Switch has been an incredible success for Nintendo and it will keep growing in the years to come when the system titles like Animal Crossing: New Horizons, Metroid Prime 4, and Pokémon Sword & Shield are finally released.
The biggest threat to Nintendo's position in the market in the future is cloud gaming services, which will allow high-end PC games to run on almost any device. If services like Google Stadia and xCloud work in the wild as they have been advertised (and that's a pretty big if), then the Nintendo Switch's status as a portable system will be threatened.
In order to play Nintendo Switch games, the customer needs to purchase a system that costs around three hundred dollars. What makes services like Google Stadia such a threat is that they work on devices that the consumer likely already owns.
The fact that cloud gaming services work on smartphones means that the potential audience is so much bigger, as it's estimated that they are owned by over five billion people around the world. Not all of those people will have access to cloud gaming at first, but the big markets like the US will, which will act as the testing ground for these services in other regions in the future.
If cloud gaming services work as promised, then pretty much any major release will run at its highest possible performance settings on devices that normally couldn't handle them. The Nintendo Switch's limited hardware has meant that some games have slowdown issues compared to versions on other consoles (like Dragon Quest Builders 2), but services like Google Stadia are promising to run games like Watch Dogs: Legion on old smartphones.
More at the source.