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.