I'll link a 538 article that gives him a very low chance, but this race ain't over yet, and if sander's wins the majority of the popular vote, super delegates will support him(At least historically this has been true for the democratic party, but not the republican, in which Roosevelt lost the nomination to Taft in 1912)
So yes, it'll take a miracle or something close to it, but Doomed is a major overstatement, as that implies that he has no chance.
http://fivethirtyeight.com/features/its-really-hard-to-get-bernie-sanders-988-more-delegates/