The lesson they will take is to make absolutely totally and completely certain that their anointed candidate is not challenged.

If Sanders wins the nomination, and then loses the general election AND the republicans keep control of the Senate The party regulars will tighten the rules even further to keep control.

What will change the way the DNC operates will be Sanders winning it all, and having the coattails to retake the Senate.

Or it'll be replaced by an organization that will. Its job is to identify and help get elected Democratic candidates across the nation who are likely to win and will promote party positions on issues, not to even the playing field for all candidates.

It's job is not even to introduce the candidates to us. That's the candidates' job and ours.

Of course, all political party structures are pretty much being bypassed these days by other power blocks.