I don't understand the point you are making here.
Hillary lost because she was a weak candidate. Prior to Bernie's rise to popularity, she was largely unopposed by any meaningful candidates in the primary. At least, that was the impression at the time:
https://www.theatlantic.com/politics/archive/2014/08/why-no-democrat-wants-to-run-against-hillary-fear-of-retaliation/378914/
People like Warren, Biden, Deval, and others sat this one out, for reasons largely unknown, to pretty much give HRC a wide open path to the nomination. Bernie's run was the only thing that prevented the primary from being one giant HRC coronation.
Perhaps a better candidate would have emerged to face Trump had they actually bothered to run. It turns out HRC was a bad choice, and not having viable candidates contesting her in the primary was also a bad choice.
It's probably good that HRC lost to Obama in the 2008 primary, even though she was the establishment "favorite" early on. Turns out the establishment is pretty crappy at reading the will of the people.
I see our current crop of candidates as a good sign. There is diversity of thought covering the wide ideology that is the Democratic party. Hopefully the strongest candidate will rise to the top, as opposed to someone that the establishment hand picks.