Many of them live in another universe where they think Hillary is Satan Incarnate and a closet Republican, so my guess would be no. Plus, he is going to annihilate Hillary by over 90 percent in Vermont, and that's the only state that should matter in this election. They will probably throw Elizabeth Warren under the bus too and call her a "sell-out" once she endorses Hillary after the primary is over. It's upsetting to see that their hatred of Hillary outweighs the terrifying prospect of electing a President Donald J. Trump.
Most Bernie supporters don't think that. Of course you're gonna have a few who absolutely despise her, and they will typically be the most vocal, but the vast majority will support her once she is the nominee. If Clinton supporters could rally around Obama in 08, Bernie supporters can and will do the same come June.