If we go back in time, we see the evolution of geopolitics sphere of influence, handing power from Egypt, the vikings, ottoman empire, roman empire, so on and so forth until the US claim the power, in the end certainly, It could be China, India or Russia will be the next superpower within years to come. :)
Every time a great power rises up and overtakes the hegemonic power there has been war, there has not yet been a peaceful transition of power where the top dog loses it and the up and coming gains it. If we can see a peaceful transition from the US to China, it won't be long before India catch up and play out a kinda of 'Cold War' with China, with the US acting as a fallen empire much like the British Empire after WW2 but with far greater consequences initially. If the US can't stop a total collapse it will make the fall of the USSR look like a walk in the park. the USSR fell from a position of strength in their people, society and culture. The US is ruined domestically with poverty, drugs and debt running rampant already.