USSR fell because it lost control of the media, and because of Gorbachev's disastrous reforms which brought down living standards. People lost faith in the system that's why it fell. In reality USSR pre-reform was doing fine, amazing compared to post soviet standards. There isn't one post-soviet country that actually did well, even eastern bloc countries there's none that did well post socialism. Even the most successful
post socialist country Poland did bad after socialism. A lot of capitalist media claiming life was terrible under socialism when in reality it's not the case.
Now all eastern European countries are depopulated and literally are worth nothing of value anymore.
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Chinese living standards are around the same as US's right now. In the future when Chinese life gets a lot better there would be no hiding that a better system exists, and Americans/ Rest of the world would demand change.