China is going to screw themselves over... Just like they have every time they have approached their potential something drastic will happen. My guess is the shoddy construction of the Three Rivers dam will fail in an earthquake. Or their ty social and political structure will collapse under the weight of an educated middle class, which will get either the political structure destroyed, or the middle class crushed.
Of course, if they do keep their course, and nothing bad happens, then they will dominate the world politically and economically.