The centralized system is great if it's in good hands but was there a time when it was in goods hands? Definitely, there were some but in hundreds of cases, the centralized system was never in good hands.
Centralized system on a global scale are never good, on a much smaller scale (domestic, inside one country) makes more sense. Take United Nations for example, it is a political organization that only serves a handful of regimes while it is completely useless for the rest of the world.
Definitely, the world will try to decentralize from one power and instead make more and more centralized unions: USA/Canada and probably some other countries together, European Union with France/Germany leadership together, Russia and some post-soviet countries together, etc.
That's not much of a decentralization, it is more like polarization where two or more "power poles" are created. The most possible outcome is 2 power houses, one in the west (US+NATO) and one in the east (SCO countries).
