Since I never liked The Mamas entry of 2020, I hope that if they'll be back in MF 2021, they better up their game.
Otherwise I don't mind seeing someone else with a better song.
I know some people talk about "fairness", but it's not as if they were internally selected by the broadcaster, nor was their victory in 2020 particularly convincing either imho. Melodifestivalen is an institution in Sweden, sort of like Sanremo in Italy, there is no way SVT will give up on that and since EBU basically said that broadcasters can do as they please for next year, and it's business as usual as far as rules go, then ESC fans just need to give up any chance of SVT internally selecting The Mamas, it just won't happen!
I'm sure though that they will be back, and they'll probably win (again) because people will pity them for 2020, and hey, if their song will be any good this time around I don't mind, I doubt it though, but I'm ready to give them the benefit of the doubt.