Trump will be the candidate. He'll smack Hillary so hard that only the dedicated will show up on both sides. Liberals tune out, independents tune out, young people tune out, poor people tune out when that happens.
Even if she squeaks by, the diminished turnout will crush Democrats downballot, meaning NOTHING will change except we aren't running backwards so much as being pushed backwards. Whoopity doo! We're still going backwards. Relentlessly backwards.
Oh yeah a candidate who's made fun of women, Hispanics, Muslims, Asians, people with disabilities, etc will cause a depressed turnout. Yep. that seems likely.