USSR dissolved in 70 years, but CCP now marks its tight grip for 72 years. Are we heading to the endgame of CCP? Maybe, because of covid. The problem with communism/socialism is always about the economy where the higher up corrupt as fuck enriching their inner circle, and the ordinary people remain poor (yes, 1st world countries also have corruption problem, BUT it's not as severe as China). Add it with no freedom of speech and stuff, including covid as the accelerant, literally will make suffering to the max.
Humans can break with a particular level of suffering, and once they break, the government will collapse.
The reason China is lasting for a longer amount of time than the USSR has to do with the fact that they made a compromise on their views, they accepted that it was impossible for them to remain 100% communist and they accepted a little bit of capitalism in order to survive, but they are not realizing that even that small amount of capitalism is going to be enough to bring China down.
In a way this is very similar to what happened to Sparta and Athens, Sparta was obsessed with maintaining their society just as it was and when they finally beat Athens they thought that everything was going to be fine but then the cultural and economic freedom of Athens got all over Sparta like a virus eventually causing its fall, and I expect something similar to happen to China.