How would that work? They can't take the fabs (single door opened and dust makes it all useless) and even if they could they can't run ASML machines with their support. So... labor camp fabs on unmaintained STOA hardware from a single company everybody relies on? I can't imagine that scenario. Either they manage to redeploy the whole value chain (not saying it's impossible but doesn't seem to be the case at scale for now) or taking Taiwan by force is mostly a political show, not a technological one.
My argument is that they would add an exception for TSMC in the event that Taiwan fell under Chinese control. The alternative would be an extreme supply shock to the industry that's responsible for most stock market and GDP growth in America.
As I said China is indeed already working on their entire value chain. They have been doing that for a while and they have made significant progress. Still so far they don't have the precision, scale and economical competitiveness than TSMC. If they get there then it will be a totally different scenario but that's not the case for now.
If TSMC were to simply disappear, it would be a great day for Samsung/Intel but a godawful catastrophe for most HPC applications and consumer hardware. People aren't afraid of a fab takeover, they're afraid of TSMC disappearing altogether.
If China has proven one thing, they can just rebuild the factories, sure it will be 5-8 years of depression but afterwards they will control a dominate player.
