By 2100 we'll likely have more than half of eartth's population being soley in 3 countries(United States with 600 million if it doesn't expand), China with 1.5 billion and India with another 1.5 billion. Imagine the power disparity between thsoe 3 and anyone else.
Fortunately, I'll be dead and not have to worry about it.
Who says its a problem? The US, China and India could take down any potenital competition and nip things like arab bitching at ISreal in the buds. That's the benefit of Global emprie.