On July 23, 2016, ahead of the 2016 Democratic National Convention, the 2016 DNC Rules Committee voted overwhelmingly (158–6) to adopt a superdelegate reform package. The new rules were the result of a compromise between the Hillary Clinton and the Bernie Sanders presidential campaigns

Ultimately, the DNC decided to prevent superdelegates from voting on the first ballot, instead of reducing their numbers

People keep seeming to forget about the super delegate reform Bernie fought for. They are still there now, 15% of all the delegates (a lot of the super delegates being democratic elected officials like members of congress since that automatically gives the status). But they can't vote in the first ballot any longer. They could only vote in a contested election in subsequent ballots, after all the other pledged delegates are unbound as well.

https://en.m.wikipedia.org/wiki/Superdelegate

Even before those reforms, they never really made a difference in any convention, except possibly 1984 when they helped push Mondale from a plurality to a majority by voting for him on the first ballot.

I'm not personally in favor of them at all, but it's not nearly as bad as it's made out to be sometimes. If we go to an open convention though, unless there's a majority choice on the first ballot, they may play a role on subsequent ballots.