I don't understand those who say if Bernie ran Trump would win 2020. That makes no sense. #NeverHillary may have been a thing but #NeverBern wasn't. Sure people didn't like how the democratic party was divided by BernieBros but with Hillary now out of the picture I could easily see the party unite behind Bern.
Those saying "NO" outright need to prepare for the possibility. It's the infighting that killed dems last time (among a million other things). You're creating a self fulfilling prophecy.
Never bern may not be a thing before but it could crop up next time if dems saw the last election as a result of neverhillary. The purity test may be applied to him this time.