We already have 3 superpowers today with potentially 2 more developing. The others don't matter at scale.
It's more likely that the cities will become the dominant form of a citizen's home sovereignty rather than a nation, with only a few national boundaries around the world. People are inherently tribal and human behavior isn't changing anytime soon but countries are quickly becoming stretched too thin to keep up with all the varied and changing populations and their needs.
It's more likely that the cities will become the dominant form of a citizen's home sovereignty rather than a nation, with only a few national boundaries around the world. People are inherently tribal and human behavior isn't changing anytime soon but countries are quickly becoming stretched too thin to keep up with all the varied and changing populations and their needs.