As for what happens if either is president and how they govern you're spot on, little if any real changes will be made and supporters get betrayed as usual.

Honestly one of the reasons I support Trump is simply the image of a strong-borders advocate winning the election, despite being hated by the mainstream media, and the effect that image has on the culture. Even if Trump sits in the White House and does nothing for four years, I think that image would be worth it.

There are also organizing opportunities like "Trump clubs" that allow strong-border anti-Marxist conservatives to freely gather and discuss important topics. Trump rallies are very similar. If Trump loses, those go away, and a major organizing opportunity is lost.