Just dropping some interesting posts I found when researching this general area earlier today:

https://unherd.com/2021/07/will-china-invade-taiwan/

Will China invade Taiwan? A panel of superforecasters considers the likelihood of an imminent global conflict

https://www.jonstokes.com/p/why-a-chinese-invasion-of-taiwan (Jon Stokes, the Ars Technica founder)

Why a Chinese invasion of Taiwan would be a catastrophe for China and the world. If they do it, it won't be for the microchips

It's not unthinkable, but continuing this line of thought, is it unthinkable that China makes a point of upholding all contractual obligations leaving TSMC's customers unaffected?

I believe that PRC doctrine for an invasion of Taiwan is to launch preemptive strikes against US bases in the region. So unless they change their strategy before they invade, the US will definitely get involved.