I don't think supers are essentially a bad thing. But they show a dissonance with the current state of the democratic voters (members) and the elites. Bernie and his support is not based in a personality cult, but in ideas that a big part of the base agrees.
You would presume such division would be present too with the elites.
No you wouldn't, or two reasons.
1) Hillary represents a lot of these same beliefs. Seriously, this idea that Bernie Sanders decides what is and isn't a progressive idea, and represents them, needs to die.
2) It should be of no surprise that the guy who has been an unapologetic independent for most of his life, and has admitted to only running as a Democrat to make use of our platform, is getting less support than the woman was who been working her ass off for the party for the last 40 years.