The sunset comes for US hegemony for the same reason that China will not succeed long term, or even medium term, for that matter: Decision making that is oppositional to what technocracy would demand. I think that it's fine to take culture into decision making most of the time, but when your process turns a full 180 from what observation suggests is the proper course of action, you will run into long term issues soci…
This is a somewhat complicated issue. Remember, eugenics, humors, etc were all previously part of "technocracy" view of the world. I'm not saying we should embrace religion/superstition/etc as an answer, but decision making in the name of science/technology is not as fool-proof as many believe.