The question is how did the book/story end? Did the problem solvers all move to this valley (Florida) and give up on the country? Did the cronies win in the end?
The power grid failed and it is suggested the cronies murdered each other and the survivors were forced to return to an 18th century lifestyle…before Galt stated at the very end that they would return to rebuild the world.
In "Who is John Galt: A Navigational Guide to Ayn Rand's Atlas Shrugged," available at Amazon, the authors addressed this question in several sections at the end of their book. How does Ameria and the world recover when Atlas shrugs? The chapter labeled "Coda" goes into detail.