This is a tricky situation for Dems. First, someone needs to convince the President to step aside,
Second, like meraglim who say “let’s have a new leader” – they do not have one leader. B carefully calibrates between all 10 wings of the D party, and he is still fretting about a group of Arabs in Michigan. Everyone coming fresh will surely eliminate someone in the D coalition and lose the key states.
Third, if B steps away from the election, then the immediate question would be – why is he still a President if his party has no confidence in him. That will make Kamala the face of US gov for a couple of months, surely not something helpful in a election.