The Democratic Party should be in revolt that Clinton stole the primary, but since the elites WANT Clinton as the nominee, that's not going to happen.
Trump the entertainer gets in the way of Trump the candidate, and everything he's been purported to do, Bill Clinton has done (and more). If Trump's behavior is bad, Hillary Clinton enabling her husband's is worse.
Let's suppose they both relieved the nominees. There won't be another primary and convention. It would be Kaine versus Pence, and Pence would win because Kaine came off as a rude, unprepared jerk at the VP debate despite the moderator who joined in to "fact check" / correct / interrupt Pence repeatedly. It came off as a biased moderator constantly cutting Pence off, letting Kaine interrupt Pence, limited Pence's time to rebutt ... proving media bias against conservatives and for liberals. And Pence's strong, mature stance and views endeared him to conservative.