If it works like Scorpio and Pro and basically only bumps resolution and maybe framerate but doesn't change the visual fidelity much or have mode exclusive games, yeah, why not?
In a way, that is a concept that works better with the switch than it does with the other consoles because you buy an add-on not a revision, so it doesn't devalue the initial purchase as much and doesn't feel like this wierd inbetween of harware revision and new generation either. Plus Ninteno has an external supplementray computing device patent, wich might be their way of future proofing the Switch for 4k.
I wouldnt get it if I didn't have a 4k TV though.







