Declaring “War” on the Democratic Party Establishment is strategically misguided. It may feel good, but it’s akin to shooting yourself in the foot. Come fall, if Bernie wins the nomination, he will need the help of the Democratic Party Establishment, party regulars, and leaders, like the Obamas, in states like PA, OH, MI, WI, IA, Fl, and NC, not to mention across the country. The overarching (strategic) task is to beat Trump in November, but a badly fractured Democratic Party will erase that possibility. And the same advice would apply to the DNC and moderate Democratic Party leaders as well.
By the way, if Bernie has a substantial lead in the delegate count in June, and it looks like he will, he will be the nominee. Only if it is close will the selection process be contested. And that’s understandable, not a conspiracy.