What the Democratic Party needs is a hostile takeover by its progressive faction. Think of it as a correction (hopefully not an overcorrection) for the hostile takeover by the DLC. The Republican Party (which, notably, does not have the "superdelegate" system) has allowed itself to be taken over by its more militant faction at least three times in my lifetime, with mixed results, but as we know, nothing ventured, nothing gained. The Democratic Party is extremely resistant to change, and their ship will sink if something doesn't change.