What establishment Democrats should be concerned about is the ascendant communist takeover of their party. Sanders/Planter/AOC/Ma’amdami policy prescriptions are basic communism with all that it implies. The AOC wing has dropped identity politics and embraced class warfare. The Democrat establishment is shackled to a corpse. There’s nothing they can do until another complete electoral drubbing.
The communists took over the Democrat Party decades ago. They are only saying out loud what they have always believed.