Trump will end up being really, really good for other countries, like Mexico. They will be forced to confront the things they would rather avoid, like fighting their own corruption. They will suffer for a few years, but if they succeed, they will have great growth.
Interestingly, the northern half of Mexico outside of the border regions are actually doing economically very well, mostly because of a reasonably literate population and the many factories in the northern half of the country. The big problem for Mexico is that they have ignored the indigenous peoples south of Mexico City, the descendants of the Aztec and Mayans; these people are often not literate in Spanish, so they can't even participate industrial production of the northern half of the country. Small wonder the vast majority of illegals coming in from Mexico are from the southern half of that country, and are not literate enough even in Spanish, which makes them a major problem dealing with them even if you're fluent in Spanish.