The unknown here is how far the infection has really hit the party.I don't see the Democrats waking up. They're still convinced that the voters who have rejected them "just don't understand". They have yet to question the principles they are selling, or why people aren't buying.
As with anything political, it's the loudest voices that get the most attention and ultimately have the most influence. But several Democrats have spoken out, and I know there are many traditional Democrats who don't like what they're seeing. The problem is that, by their very nature, they're less likely to be the ones screaming and losing their shit.
So the question to me is whether enough momentum can be started and maintained for the nutters to be marginalized.
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I don't see it happening in time for this election. And I'm not sure the nation can survive another four years of the Trump crazy train.