Assuming that we're not in the <1% of universes where I somehow join the #TrumpTrain, I would simply vote third-party again if it was Clinton vs. Trump again.
Even if Comey is right that what she did wasn't technically a crime, Clinton was extremely careless and put our national security at risk with her email system (especially when she allowed her staff to send highly sensitive equipment through the public snail mail system), and even worse, she doesn't believe she was extremely careless. Even if I forget about that, there is still a list of at least 20 different things, from her calling pro-lifers terrorists, to her calling the entire republican party the "political enemy she was most proud of making", to her flip-flopping on immigration so many times that I'm not even sure what her final position was, to her showing weakness by refusing to form an opinion on Keystone until 99% of the world had an opinion on it, to her incredibly spineless and dishonest TPP "flip", to her working with party leaders to rig the primary for her as much as legally possible, to wanting to repeal the Hyde Amendment, to her support for socialist health care policies like the public option, etc. etc. etc.
At this point I'd write in Mickey Mouse before I would vote for Hillary Clinton. I can barely believe that I almost voted for her in 2016 - In fact, if the election was held in September, I almost certainly would have. God brought me back from the brink because he knew that if I did it, I would regret it for the rest of my life. And I would be a very bad christian if I were to turn around and vote for her a few years later, whatever the justification.
If Hillary runs again and wins the nomination, the Democrats will have in my opinion have learned no lessons from 2016.
-I would not be surprised. I suspect the Black, Southern White, and Hispanic votes alone could nominate HRC in 2020.
