What kind of superpower could China be?
A common reaction to the idea of China as a superpower is that it will be like the US - except worse. Worse because it is not a democracy, it has a communist government and because its people are not like us. I guess that gives some the jitters.
In fact we should not expect China to behave in the manner of the US. It will be very different. And nor should we assume that it will necessarily be worse.