America would have to do nothing like invade Mainland China to topple the CCP. War is the authoritarian achilles heel since time immemorial and China knows it (Russia doesn't), otherwise they would've taken Taiwan 10 years ago. China's best case scenario is if it could find a way to take Taiwan like they took Hong Kong, on a technicality and relatively quietly.

[1] https://en.wikipedia.org/wiki/China_and_the_Russian_invasion...

P.S: I especially question the mental faculties of someone who can't see other angles to a problem. China's hegemony is the mainstream opinion, it's obvious. Maybe try to question what you're not seeing now.