China is likely to be the next world super-power. They have the resources, the population and I believe they can sustain it economically and socially if they adopt some from of democracy or republicanism.
What they would adopt would likely be a sham of a democracy. The people would have an illusion of having some legislative powe without having any real say in the matter. Who knows what their constitution would look like and what rights it would grant. Certainly they wouldn't operate on the doctrine of 'natural rights'. Even so, it's probably better than nothing for them.
It will cause us endless problems though because they will eventually unhinge their currency from the dollar and we're going to fall apart.
I'm guessing that this will happen in about 10 years or so.