I think that this Sander's statement during the debates will be proved to be all for show and nothing else. The very fact that he hung on was because he could see the train wreck emerging and wanted to be well prepared and positioned for this eventuality. And so here we are....
The bigger question is "what does Obama have the guts to do?"
I maintain that Hillary has significant dirt on Obama and has details of operations like what was actually going on a Benghazi (likely gun running to ISIS or parties just as bad) and other illegal operations. Obama can destroy Hillary but she can gravely wound Obama's legacy and his future as a power broker. It's a mexican standoff. Obama is letting the noose tighten around Hillary but he won't pull the lever.
My prediction: A back room deal will be worked out which keeps Obama in power behind the scenes in return for this case going away and Hillary being silent about everything she knows. For example, Obama selects Hillary's VP, Chief of Staff, and several cabinet officials is the sort of deal I suspect is being worked out.