Yup. Strip away all the breathless anxiety and hidden agenda's, here is the reality: If Biden withdraws, I simply do not see Harris emerging with the nomination at the convention, and if she doesn't, and Black America says to itself - "this system is always going to shaft us no matter which side" and stays home, the dems cannot win anyway.
On the other hand, if Harris were to be the convention's choice, then it's a pointless exercise because she is already next in line if Biden is incapacitated - all it does is create likely convention chaos for people for all angles to get their panties in a bunch over.