The truth is no one knows what Trump will actually do. Trump can say whatever he wants during its campaign it doesn't matter. No one knows what he will do if he ever gets elected. All people know is that he is a business man with a big ego, he isn't even a conservative at all, he is the pure product of the New York upper class culture.
Hillary on the other is as hawkish as they come, this was demonstrated through her emails. She is a neo-con.
Plus Trump has a fascinating way to reduce his program to a few slogans he repeats over and over and lets everyone else interpret what he really means...
However; I do (still) find it unlikely that Trump will be the next president. And I am also not quite sure what his foreign policies will be.
Another big change may come from Britain's exit from the EU (also something I find unlikely). This will be the end of EU as it is today. And will probably lead to a more protectionist and less interventionalist foreign policy regime across the board.
The EU needs reform. However, historically Europe engaged in very nasty wars every few years. A fractured isolationist non-corporative set of European states could be very bad for all of us.