Her delegate lead is so huge that she’s still guaranteed to win.
There’s no winner take alls on the Dem side, and the superdelegates are not going to switch to Bernie.
You’re right. That means Biden steps in at the convention. And, the commie picks up his marbles and runs as an independent. Hillary at that point will be either be undergoing medical treatment for a serious medical problem precluding her from running or taking a well deserved dirt nap.