Wave of Empires, what will be next?

Wave of Empires... From Old Egypt to Assyria (747 - 631/626 BC), to Babylon (668/626 - 539 BC), to Persia (559 - 330 BC), to Greece [Agread, Diadochi, Babylon rulers, Ptolemaic] (334 BC – 30 AD), to Rome (30 – 14 AD)… to UK (colonial era) to USA (economic big brother) to “What will be next?” Possible be USA [ + BRICs: Brazil, Russia, India and China]?