With respect, we don’t have that many fab engineers any more. At least, not of that quality. And most of the ones we do have are already locked up by other employers, like Intel, IBM, and the other companies that still have some fabs here in the US.
Sure, we can do small scale cutting edge prototype fabs, but the few production fabs we have here are not TSMC quality (go ask Intel), and they are already fully allocated. Many of those might not exist here in the country at all, if it weren’t for the requirements from the US military and certain other classified customers to have certain types of chips made here domestically.
We used to have a lot more fab engineers here in the US, but we outsourced those jobs and sent them overseas. And the people who used to do that work have moved on to other careers, or retired.
And the reason why Silicon Valley has so many EPA disaster area cleanup sites is because of the fabs(and related businesses) that used to be endemic in that part of the country. Fabs aren’t clean businesses to run. You’re going to have to find a place where you can run those dirty kinds of businesses, and that’s either going to be extraordinarily expensive, or even impossible, due to legal restrictions on the use of toxic chemicals, etc….
There’s a reason why those fabs are overseas. And all those reasons are why it’s going to be extraordinarily hard for us to pull that work back. There’s a reason why Steve Jobs and Tim Cook have both said “those jobs aren’t coming back”.