I can predict he'll start isolationist trade policies
Which is just a lot of talk and not much else. A president isn't a king. He has to follow the law. Especially Trump, because he won't have allies in the press actively hiding information that might be bad for his administration.
that he'll prefer Putin to our historic allies
Like the current President prefers Iran over Israel and Cuba over the UK. But, again, mostly talk.
that he'll poison our relationship with Mexico
Our relationship with Mexico is valuable to Mexico. How valuable is it to us? Since Mexico has less to offer than the benefit they receive from our "relationship", they're hardly in a position to hold a grudge over some meaningless talk and the US deciding to secure the border.
that he'll cause a crazy debt default incident
Good. The last one of those helped slow down runaway spending. It was the end of the world for about a week though. I'm sure there will be a lot of pearl-clutching and dramatic gasping and head-shaking by people who think it makes them superior to the rest of us.
I'm not panicked yet. Keep telling your stories though. It's fun to tell stories.