It may take another 30 years or so until China has replaced the USA as the worlds leading superpower. As a moral authority however, they finally ceased to be one.
I would say they gave that up a long time ago with their foreign policy. The CIA has committed many war crimes since its inception, and the military industrial complex has been gaining power since WWII. All the lies to get a gullible people to sacrifice their children to go over seas and kill millions. People have been awake to this for years yet most Americans still believe they are being attacked because of their 'freedoms', and 'freedom' is only a word that they have no clue what it actually means, if they did, they would actually be fighting their own government to get it back.
EDIT: Another example of lies to get the Americans all riled up to go to yet another war. Wait and see, they will be dropping bombs by the thousands again in no time...