There is still enough time to get Uncle Joe on some later ballots so that he can collect delegates prior to the convention. If Hillary is forced out after Super Tuesday, her accumulated delegates would be free to vote for anyone. Sanders is unlikely to have enough delegates to win...then, we’ll see Biden/Patrick or Biden/Warren...I think the Hildabeast may be coming down with some brain ischemia that can only be cured by a Presidential pardon!
I'm not sure of the rat party rules - but in an emergency, can't dem bosses nominate and give the nomination to anyone they want at the convention; someone off the bench?
The fact dem electors didn't vote for the nominee in the primaries should be of small concern.