um, with the % of world population etc....thats not really domination or china has already won in real life. yet the usa is more powerful than china. and russia has more landmass.
i think what you are really describing as domination is CULTURAL domination, isnt it? which pretty much the usa is doing right now, imposing its culture on other nations. i want to say something about vassals at this point, as part of domination. i do think being able to have vassals, particularly when a nation for no reason says its afraid during diplomacy. if you can make the whole world vassals, CS and other civs, thats a total domination through fear, and i would count it as military and cultural and diplomatic victory all rolled together. and about as rare as horses laying golden eggs probably.