That said, the two absolutely hate the Clintons. Michelle cannot wait to get the hell out of the White House while Valarie will be dragged out kicking and screaming. Barack will be happy to sit on the sidelines raking in cash for speaking fees and will be a loud mouth in the press for the next 4-8 years.
It stands to reason that Clinton's dilemma really is up in the air. Obama may choose to let the Justice department loose. Lynch will follow orders no matter what. If that happens she AND Bill are screwed. We're talking a massive RICO case here. That would seal the Clinton's fate and they will fade off into obscurity (and prison and bankruptcy eventually).
If Sanders wins CA, even if he comes close to winning, the convention is going to be an absolute mess. I doubt it will rival 1968 but it could come very close. If Clinton can't completely seal the deal on the first vote it's going to be a complete and utter free for all.
Keep in mind that Obama (Jarrett) has preferred a Biden/Warren ticket all along.
There will be a Quid pro Quo with this. Charges will be threatened but not filed, Hillary will "graciously" drop out (maybe cite health), and Obama will give both B & H a blanket pardon.