Obama is a narcissist. He feels that no matter how bad it is, or how bad it gets, he's going to make it. As in, win re-election. He can do it based on how awesome he is, or so he thinks. To kick Slow Joe off the ticket and demean himself to ask a former rival to take his place would be one of the top humiliations for Obama. He's not going to do it, and Hillary wouldn't accept even if he did.
Remember, there's two Clintons with higher asperations for Hillary, or there were, anyway. Bill still has his hatred of the Obamas (both of them) burning hot. It's just not emitting much flame at the moment.
Does that answer your question, Gina?