We've survived great fires that destroyed whole cities. We've survived a civil war and the two worst global conflicts the world has ever seen. We survived the Gilded Age, a labor movement, serious periodic recessions, and actually quite a number of crooked, incompetent presidents (like GW Bush!) We've brushed off attacks by communists, fascists, and Christians.
When our Constitution was finally finished and signed, many of the framers believed they'd failed. They felt the document was so full of compromises that it couldn't stand, and they'd have to do it all over again in another 20 or 30 years. But it's lasted longer than any other such document!
Trump will be succeeded by a Democratic president who will have a much easier time fixing what Trump broke than Trump is having in his effort to reverse everything Obama did. Just as with Obama and Bush. Trump is certainly evil, but on the good side, he's extremely ineffective!