If and when Trump gets voted out of office or finishes his second term, we will have another Trump-like candidate. His cult of personality is here to stay for generations to come.
I think what Trump's presidency has shown, if only because he is a catalyst for hate and ignorance and little else, is that the sentiments that drove the civil war never actually went away and have probably gotten worse and drifted even further apart. His presidency gave a conduit for these things to bubble up to the surface. And there's a certain political party that partially shares the more hateful sentiments but also just wants to profit from them and manipulate the very people who are a subset of people that their policies hurt.