I've always liked JB but I have a feeling that, with so much of his family gone too early, I think he's lost his spark. I think he's ready for retirement.
It's not going to be who you want it's going to be who party bosses want.
If Hillary goes down after winning most of the delegates they will need someone who can rally people at the Convention. It's not going to be Bernie at his current rate of winning delegates. Maybe if he comes in w/ 35%+ of the delegates he has a shot.
I would also add that such is the ambition of Hillary that she would probably not step gently aside if she were merely indicted. I also think the odds are low she will be indicted. If I were to bet, some of her aides will either be indicted or sanctioned for taking confidential information from secure systems and sending it on her system and she will plead ignorance, stupidity and it's all teh Republicanbzz!!1!! fauklt and people like Higgins will nobly defend her.