Not that I'm a Trump fan by any means, and I have no delusions about him ever becoming a progressive, but if he didn't opt for establishment Republican names-- at least in the beginning-- they would literally kill him. (It's not like political asassination hasn't ever been used before, y'know.) Leaving, for our consideration...President Pence.
As Mumia Abu-Jamal has preciently stated, "If Trump is the price we have to pay to defeat Clintonian neoliberalism – so be it."
I'm taking a cautiously optimistic approach, because, well, what other choice do I have? Taking the long view, global warming is only issue that really counts, and unless we eliminate capitalism by last year, nothing will be done about that. The future would still be bleak, but I do know that things will not be any worse under Trump than it would have been under Clinton.