Perhaps funny at this, but turn into a reality for next November. The Donald is still in the lead in most places.
Biden's entry may totally depend on Hillary. He obviously wants it since the has been a candidate before. If Hillary cannot get out of the bright lights of investigations, she is going to tumble. The timing is not that of the investigations, but her ducking and dodging and total procrastination/failure to cooperate a year or two ago with Legislative inquiries. IMO, she will maintain about a third of the strong liberal support she has. Maintaining support of the female independents in any large numbers will be questionable as voting season begins. She may do fair in the first three, or two of three, states
If Uncle Joe decides to go, this is probably his last chance to run for President, I think there will be a strong swing to him and Hillary flatten out and dwindle to her core of about one third of Dems. And in 15 political months, the world could come to an end.