If the party was really concerned about squashing populist candidates, then why wouldn't they get rid of the large number of caucus states? The states set up their own rules for how they run the primaries and most have been doing the same thing for quite some time. At the end of the day, Clinton beat Sanders in open and closed primary states. He won quite a few more caucus states than she did.
The number of debates was pretty much in line with past elections and the viewership was in line as well. Sanders crew started grasping at any straw they could.
Get rid of the superdelegates. They don't matter. If they would have been used at any time, it would have been 2008 when Clinton had more votes than Obama but less delegates.
The debate question thing was really dumb, but the Sanders crew went off the deep end.