Who is their counter-weight for future? As an outsider who doesn't watch US news regularly since they use pretty idiotic form most of the time, I know 0 powerful persona types of Clinton or Obama. A lot of blahs and farts in the wind, when you are against an expert populist that's not a winning recipe.
None of that changes people being willing to vote for a pedophile conman.
I believe Republicans actually have a democratic nomination process without superdelegates, which is how they got Trump -- IIRC he had a few early wins and snowballed from there.
How she did it could probably be the subject of an entire book, but no one has ever come up with any particularly scandalous stories about it so far.
Trump likely would have lost against almost any other candidate, but he had help from the Democratic party, who treated Hil's nom as a coronation.