One thing that I notice about online discourse about Nintendo Switch Sports is how many people talk about how it’s a travesty that Miis are just relegated to a side option, and how the Sportsmates are a weird choice to replace them, but… if you’ve played the game a lot, it’s pretty clear that the game’s actual player base really prefers the Sportsmates instead.
Personally, even though I’m a longtime Mii fan, I do think it’s time for a change whenever Nintendo’s next console rolls around. I don’t think Sportsmates are customizable enough to fill that role, but it would be nice to see something fresher and more versatile (but probably not as versatile as Miitopia Switch’s Miis, since that wouldn’t work too well in online multiplayer games.) I can see Nintendo completely abandoning the idea of custom avatars with the next console, though, especially if it continues with the Switch’s “this is just a game console, it plays games, nothing else” vibe.
I’m a Squirrel main in Switch Sports BTW.