I think any revolution is fairly unlikely while China continues to grow rapidly under the CCP, but if growth stutters or corruption becomes overwhelming (or if America collapses and stops buying Chinese goods), it could happen. The catalyst for most revolutions seems to be when people give up on trying to expand the pie and start stealing slices from less powerful countrymen, causing widespread resentment.

I'm just thinking back to other revolutions that have occurred, though, and they usually take people outside the country by complete surprise. I was a kid in the 80s, and the Cold War was basically a fact of life. I had an international relations professor who was in the Pentagon when Gorbachev was deposed, they had just completed their 5-year geostrategic plan, and nowhere in the plan was the possibility that the USSR might not exist. Same with the Arab Spring - from the U.S, it was like "What the hell is happening?"

Interestingly, it was not clear at the time of the American Revolution that it would result in a liberal democracy. It seems that the expectation at the time is that it would result in total anarchy (the way the Syrian Civil War has), with the colonists killing each other, and it almost did, and it wasn't until almost 15 years after Lexington & Concord that it was clear (with the ratification of the U.S. Constitution) that it wouldn't. And maybe that's the mechanism by which a wealthy & well-networked middle class leads to democracy: in states without it, a revolution collapses into anarchy and the elevation of a charismatic dictator, while with it the various interests need to negotiate and share power because each of them needs something that only the others can provide.