Didn't the DNC largely get taken over by progressives already? Which is probably why progressives are sometimes winning primaries now: The DNC aren't ratfucking them anymore.

For those complaining that the DNC not endorsing progressives until after they won the primary -- that's what "not ratfucking the primary" looks like. The DNC is not supposed to play favorites in the primary.

It's going to take a while before there's traction in actual Congress, though, because they take longer to replace. But as soon as you have enough progressives to get actual leverage, you're going to start seeing a lot more happening.