The other problem for Hillary v. Trump is she sucks in Open primaries, and Bernie often did better than expected there.
Not saying Indies will go Trump, I certainly will not, but the most likely situation is simply not voting. Which again makes it a Base GOTV election. The Berniecrats and Independents whom supported Bernie are likely just disaffected voters whom won't show up to the polls come November. So Hillary has to rally the Democrats who aren't Bernie voters against Trump's base which is very dedicated.
And whilst one can mock the dedication of Bernie voters, either Bernie voters are small, but big enough to cause a storm and threat to Clinton, OR aren't super motivated and if they were just not as motivated for Bernie, why would they rally for Clinton?
Hillary is going to enter a lesser of Two Evils election, and I suppose is hoping to be the lesser evil. But do people turn out the vote in those elections? Plus looking at voting returns the chilling effect of DNC apparatchiks and Hillary's supporters trying to suppress the Primary process to give Hillary a smooth road to the Nomination has severely depressed turnout among Democrats. OR Even if you don't believe the DNC's thumb was on the scale, Turnout was poor among Democrats imply a severely weak interest thus far, were as the Republicans (Trumps Republicans anyway) are fired up and excited. Trump thus far not just Kills it in GOP primaries but does well in the Open primaries. Which means he is going to bring in people or IS bringing in people. Hillary? Idk if she is registering lots of new voters to her cause, but I know her campaign, and its supporters desperately want them gone and to go away.
Hillary's campaign dedicated itself to "Destroy Bernie, Unity later," Well exactly what is her plan for Unity?