If Nintendo doesn't even have a real leak of them planning on Tomodachi Life for Switch or the Switch 2, I think Miis are going to be completely gone from the Switch 2 onward. Miitopia was a relatively short-lived game, it was popular for a month or two, and then people got bored because they realized "this is just the 3DS version, but now with horses and basically turning the Miis into a canvas"...