A similar thing happened in Detroit. Detroit went from 97.5-2.1 Obama to 94.9-3.1 Clinton. Considering that Trump won MI by just 10K votes, that is a significant shift.
As i mentioned elsewhere, many of Detroit's wealthier, better educated Oakland County suburbs moved toward Clinton.
I think it was more "away from Trump/away from non-Romney," and how many of them actually flipped? I think people are really underestimating how important it was to Trump's victory to hold onto as many educated and wealthy Republicans that he did (in addition to the new supporters, of course). If he had anywhere near the "collapse" among wealthy and educated White voters - two groups that he literally won, yet we're acting like they're a Democratic group now - he would have lost the election.
