Unless CCP somehow screws up the economy really BAD, driving everyone to the point of starvation, nothing will change.
And even then: looking at North Korea, people there were driven far beyond the point of starvation, and they still endure these hardships without any discontent against Kims.
Take a look who took over the power after a collapse. In 9 out of 15 countries, the people who came to power after the collapse were ex-KGB
Of course, in most republics local elites have cleverly kept the reigns of power in their hands, but those were the Party officials, not KGB officers. I think that Russia is the only ex-USSR country where KGB managed to seize complete control. Others are democracies (Baltic countries and, arguably, Georgia and Ukraine, maybe even Armenia), authoritarian states (Belarus, Russia) and a number of sultanates.
Side note: 2013-2014 protests in the Ukraine worked for a simple reason - not only protests enjoyed an overwhelming support in the capital, and had a fraction of parliament supporting it, Kiev is relatively close to western Ukraine, so many active protesters from there just got on buses and drove to join the fight and make the balance more even.
This said, I believe that the bigger the country, the easier it is to control, because government forces are way more mobile, which easier brings local numerical superiority. As for imprisonment, in a bigger country you just need more prisons, that can be achieved without much difficulties.