No. Personally, I think that we should be getting new songs in 2021 - especially since countries like Estonia have already mentioned that they will be hosting a national final - Also, the Belgian entrant has already said that they would like to compete with a different song.
It would be strange to have a mixed bag in 2021 (like 2020 songs, new entrants, old entrants with new songs).. it should be fair for everyone! Also, the Eurovision Song Contest is highly popular and successful in the Nordic countries and it wouldn't be fair to not allow these countries to host Melodifestivalen, Melodi Grand Prix again.
If we get rid off all 2020 entries, we fans can get more songs in total + two valid Top 10s for our all-time rankings.. one for 2020 and 2021.