Not going to get it this cycle. Have to already have a nominee prepped that doesn't make stupid promises on party unity. She/he also has to perform like Sanders is doing now. He would've been the perfect candidate to split the party, and blamed DNC shenanigans for it. Gotta find out if the FEC investigation was politically motivated.
I say if any evidence of the DNC or Feds fukking with this election is found, Bernie uses that to break his word, as it wasn't taken in good faith and go for it. The 3rd party needs to start soon, but it has to be under ideal circumstances or a very big groundswell of discontent.