DC does not work the way you think it does.
Joe and Jill will have zero input when it is time for adults to make a decision.
I realize how it works. You also have to understand that Biden has half a century there, too. Democrats are in a real pickle, especially because of Harris, inability to invoke the 25th and the reluctance of many old Democrats on the Hill to abandon him, despite what the column-incher pundits will turn to. They’ll have to pry the nomination from his old bony claws (and Jill’s) first. Not a ‘done’ deal.