I mean, I would understand it. The Switch is probably about to fall even farther behind in AAA third-party support as next-gen comes around. While I am very happy with how good the software looks on Switch, I expect to see 1 million hot takes about the graphic fidelity of BotW 2 next year. Nintendo's first party studios could realistically get the most out of the Switch's hardware for another couple of years (Replicating the lifespan of a normal console generation), but if they can get the jump on a Switch Pro that is essentially a next gen system with perfect or near-prefect backwards compatibility, I can't say I would be too upset.
This being said, I bought my Switch in 2017, so I will be going on 4 years with the console. Obviously my PS4 took me through 7 years, so to look at something similar with the Switch, Nintendo would be dealing with a console that struggles to run PS4 games all the way through 2024, where the PS5 will be well into its prime. It's just unreasonable at that point, and I'm sure Nintendo knows that it makes more sense to have an upgrade within the next 2 years that is going to offer, most likely, some third-party games at the very least, that won't run on the original Switch.
But will Nintendo release this console that is the only way to play something like Mario or Zelda? No, that is clearly not going to happen. The Switch's install base is insane and with the software sales that Nintendo has seen thus far, it makes no sense to limit these games to what would be a significantly smaller install base.