Russell has no points this year.
When he gets a few points then we can have a discussion about replacing Bottas.
Bottas is multiple race winner, many podiums, and not just mercedes.. podium and points in a Williams against a known quantity like Massa. Something Russell is still hoping to acheive.
Russel should go to a midfield team before mercedes. He is too much of an unknown and risk for mercedes. He is yet to complete a strong race. The "almost made it to Q3 and almost score points" gimmick gets old and is not enough for him to get a top drive.