Prediction (no, I am not a prophet):
Hillary waits until the last minute before the convention when it’s clear there is no strong leader, then she’ll announce. No debates, no wrestling with other Dems for the slot. It’s hers for the taking at the convention.
But then what happens during the overly demanding campaign? She’ll again cough, collapse, trip, feint, and be crushed by Trump in any debates.
Bring it on Hill.....bring it on......
If the convention nominates someone who didn’t even compete in the Primaries, then Bernie’s socialist faction will be seething, and they are pretty much guaranteed to run their own candidates. It may not be Bernie himself due to age but it will probably be him and a female who is young.
I think they would have a good chance of drawing more votes than Hillary.