I think that's a fair question, and the answer depends on how far the Overton Window has moved to the left, what the Dems consider establishment, and what they consider Progs. There's people in Congress, mainly Democrats, who were in congress when I was still in college - let that sink in! I'm no spring chicken, lemme tell you. But that field is thinning, rapidly. What's come in to replace that, has waxed and waned on how far or near left they are. But to get to the crux of your question, if the Establishment Dems are more like the Progs, the answer is "not very". The thing is, the SKWAD and other Prog dems are so...utterly alien, I mean, this is not a "Hey, $.02 sales tax to make sure kids have hot lunches at school" crowd this is a "Yes I'm a communist, lol that's not a threat to anyone!" crowd. Which scares the living shit out of me. I mean, goddamn, the philosophy these people push is something that even the older folks in Congress they work next to fought to stop from ever happening in the US! So I think if there's enough Establishment Dems (more like Manchin, less like Butt-edge-edge) to fight like hell to stave off the Long March through the House, then yeah.
If there's not, then our government will soon be at war with itself and at war for the survival of our country: Communists and Socialists vs. people who want freedom.