The pledged delegates will decide it. Neither the Dem powers-that-be nor the superdelegates will dream of countering the popular choice. It would be a nuclear meltdown in which they would be immolated.
Why are the press and the bloggers spending so much time on this?
There’s only one situation in which the superdelegates might have to make a non-trivial decision: if one of the popular measures (primary votes, caucus votes, pledged delegates) disagrees with the other two.
If that were to happen, it would be a story worth discussing.