The Democrats are stuck with Hillary. Why do people think she’ll just back away willingly. The Dems may have the goods on Hillary, but she has the goods on them too. It will be mutual destruction if Hillary is not accepting the nomination in Philadelphia in July.
In a fantasy world where Bernie outmaneuvers Hillary and became the D nominee he'd fare even worse in the general than she would as he's proven he does extremely poorly with non-white voters and that's absolutely fatal to has electoral chances.
The even deeper fantasy where some "white knight" rides to the rescue simply means both Hillary and Bernie supporters will feel cheated.
The Dems can pick any door they want, but all they're going to get is President Trump.