If progressive are going to gain a foothold in American politics, it'll be despite and not because of the DNC. For as shitty as it is, Trump put everyone in place by winning again and again. He selectively sought retribution, but mostly took them and put them in line. Now they can't be happier to go to bat for him.
The only difference will be the GenX Democratic elite will say they always believed in these ideas and are glad to have helped in the fight. They wouldn't have, but they need to save face.
Stop getting mad that the established democratic leadership lies and cheats. Call it out and get back on message. I think the messaging is stronger than their relexive grasps to hold on to power despite having no vision of the future.