The problem here is that this reality pushes many of these companies to support U.S. government policies that may not be in the best interests of the U.S. in the long run. Boeing, for example, was a huge advocate for the Obama administration's Iran deal -- because as part of the deal the Iranian government would agree to buy aircraft from Boeing instead of Airbus.
Globalism isn't just a trade issue ... it's a geopolitical issue with major ramifications across the board.
No, they'll just continue building them themselves.
That's not the only thing, it seems almost anything we want to "sell" in China needs to be manufactured there. Many auto parts including complete GM 3.4L V6 engines are imported from China.