The real question is how unprofitable will it be to remain dependent on Taiwan in the face of the inevitable conflict coming with China. US and Europe based fabs could literally lose money and require subsidies and still net out as less expensive.
while China invading Taiwan is not a guarantee, it is certainly highly probable. this risk should be taken into account by the us government
Chinas activities in the South China Sea, the fact they openly say they will integrate Taiwan, by force if necessary and unemployment being 20-30% for young people are just a few red flags.