"If Dems were going to do this, it needed to be done months (if not years) ago.
If Biden decides for whatever reason to drop out, then we all have to get behind Harris (who's unfortunately polling worse vs trump than other options)."
I agree, however in my view it is not an IF but a WHEN.
As one commentator said (don't remember which,) Biden had but one job that fatal evening at the debate: to show that he has up to do the job.