Will he stay or will he go?

I see that the Biden family is gathered at Camp David this weekend where they'll discuss the future of the campaign.  One poll I've seen shows only 23% feel he's physically and mentally up to the task.  Evidently, four swing states cutoff dates that have already passed to get on the ballot.  I suppose a new candidate could do a successful write in campaign with the parties help. 
I'm not a gambler, but if I were, I'd put my money on Michelle obummer.

IF big Mike were to replace FJB on the ballot, it would likely only be because he is the only possibility they have to rouse enough of their base to have a chance, and he would only hold the position as long as required prior to stepping down and having the VP take over for the remainder of the term. To pull that all off in just over four months is a hell of a long shot, and nothing I would bet on.

Newsome would be nearly as long of a shot, too. Too many people are aware of what he's done to Commiefornia.
Next best would probably be Wretched Whitmer, and she's a verifiable nightmare waiting to happen!