There is an undue focus on CE. If CE, it's allies and Darka weren't dominant, than some other group of realms would be.
This is a very common misconception—and hardly one limited to BM—the idea that "if the groups that dominate this arena were to be wiped off the face of the earth tomorrow, some other groups would rise very quickly to exactly mimic the current situation."
However, it's also very rarely true.
Much more often, if you removed the groups that currently dominate, especially if there are a few very powerful players among them, you would see a much more diverse and fragmented lot appear to take their place.
And for Cthulhu's sake, if you were to destroy "CE, its allies, and Darka," that would remove most of the realms on Atamara, so what would grow up in their place would be pretty completely up in the air.
