I bet you won't get those two large size pizzas sir
Hong Kong is a entirely different case . It was leased out to the british empire for a span of 99 years by the Qing dynasty . As the lease expired china moved in with british consent . What happened in Hong Kong was internationally accepted but if china does a move against taiwan then it would be suicide for chinese economy and military .
Again, I repeat, China will have Taiwan.
The world's response afterwards is nigh impossible to judge this early but I won't be surprised if it's hemming and hawing instead of something concrete.
When the response to an outright invasion by Russia of Crimea is just a flood of trade sanctions (when Russian military is arguably weaker than the Chinese, not in quality but in quantity), I think we're expecting too much from the US in defending Taiwan.
US behaves like a bully. It's eager to go to war with weaker, disorganized nations on the cusp of implosion (Iraq, Afghanistan, Grenada, Cuba, Libya, Vietnam) but incredibly cautious when the prospect of going to war with a near peer force comes up (USSR, Russia, China, India and even NoKo).
You guys are not wrong in your assessment that the invasion of Taiwan will negatively affect CCP's longevity, but it
WILL happen and and it's too early to say what the world's response will be.