Is there some significant contingent of Era that wouldn't?
It seems like this point becomes a huge presence in every thread about Bernie, but crossover voters are a tiny group that are present in every Presidential election for one reason or another.
Any non-Bernie Democratic voter will likely have crossover voters too, and those voters will be just as guilty of re-electing Trump as the millions that have already decided to vote for Trump.
This discussion always comes off as disingenuous, and nothing more than an attempt to attach Bernie's candidacy to Trump's victory. If Bernie had won the nom in 2016, would everyone have blamed Hillary>Trump voters if Trump had won? I doubt it.