No one. Tons of people have been over this recently. Last time such a scenario happened was when LBJ walked away in 1968 and Nixon was easily swept into power. The parallels are uncanny. Anyone calling for Biden to walk away at this stage are completely ignorant or acting in bad faith.
Yeah if Biden had promoted someone else starting a while back it would be different. But everyone calling for this now is playing with fire. They’re more concerned about not losing than rallying around Biden to win. Pushing him out at this point is going to cause enough disruption to guarantee Trump wins.