Who is going to replace it? Some people say China, but then the Zeihan POV says their population is too old, they lockdown every three seconds because they stil

Who is going to replace it? Some people say China, but then the Zeihan POV says their population is too old, they lockdown every three seconds because they still haven't developed a competitive vaccine, and that capital wants to escape the country at record speed seems to indicate its not China (again according the to Zeihan fanboys). Whats the counter argument? I can't see any country overtaking the US. Maybe everyone collapses into a worldwide depression. Maybe thats possible.