Tt's one race. It was a great race. Russel clearly fits in at Mercedes. Should he be in the silver arrows in 2021?
I say 'no'.
Reason 1. With 2021 rules being more or less a 2020 do over, I see little reason for anything to change. Mercedes will be at the front, with their top driver winning the WDC, their second driver runner up, and the team winning WCC. The team as is works, why mess with that?
Replace Bottas with Russel is he going to be MORE second?
Worse, what if Russel is ahead of Hamilton,and on track for the WDC? We saw what Hamilton did to Rosberg. What's he going to do to Russel? Russel might be able to take it, but maybe not.
The other option is to replace Hamilton with Russel. Mercedes has the chance to be in the record books for being the record setting 8th championship for Hamilton, with his picture associated with the tri-star forever. Who wants to give that up?
Now, if 2021 goes off poorly, Hamilton doesn't have the 'drive' that makes him Hamilton, or Bottas gets too far in his head worrying about losing his seat, THEN Mercedes can do a 'call up' for Russel part way through the season. Otherwise, they run the risk of replicating Hamilton/Alonso in 2007 or Vettel/LeClerc in 2019. Making a champion feel ordinary doesn't help anyone.