Unless a series of unfortunate accidents occur at the TSMC fabs long before China can put them to use...

We’d blow up the fabs ourselves.

But it’s in Taiwans interest for us to continue to provide them arms, training, and build regional alliances to pressure China.

I’m also not as convinced the US wouldn’t respond, but it would depend on South Korea, Japan, the Philippines, and ASEAN nations to call for such action — if they felt threatened enough by China’s actions in taking Taiwan and Philippine islands to declare war themselves.

Edit:

Including article discussing blowing up fabs and Taiwanese response that cutting off ASML and similar would be just as effective.

https://www.businessinsider.com/us-would-destroy-taiwan-semi...

  We’d blow up the fabs ourselves.

Nah. You're not thinking this through. That'd start WW3. China considers Taiwan as a province of theirs. Bombing anything in Taiwan by the US would be the same as bombing China itself to the Chinese government. If the US bombs China, expect China to declare war on the US. Have fun getting drafted in the military.

Not to mention it's the quickest way for Taiwanese people to completely turn on the US.

If the key thing is to avoid China getting access to TSMC plants, I'm sure there are ways to do it without risking US troops. The West would have to live with inferior Intel nodes for a while, but it would be better than anything China could produce.