I think Biden will get in the race. I didn't used to think this, but I do now. I don't think he can resist the need to try again.
I think that still another Democrat could get into the race, perhaps more than one. I think Gore may well enter if Biden enters; he's another "last chancer". Brian Schweitzer may well decide not to postpone an ego trip.
Really, I can't think of anyone else who could command funds, though. I think Biden will not win, and only Gore could upset Hillary. Gore is kind of the RFK to Sanders's McCarthy.
I could see it now:
Gore 2016: I'm here to reclaim what's rightfully mine.
I think that message might actually resonate with voters.