The auto industry buys bolts and makes pistons because the marketplace can't make pistons, roughly. They have the know how if the bolt marketplace collapsed to turn steel rod into bolts, maybe not as easily and cheaply as it can be done now, but if the bolt market died they'd make their own bolts.
The commodity microcontroller is dead. My guess is crappy "homemade" older-gen FPGAs made by GM for GM products will be the future of automotive ECUs and other automotive apps.
In 1980, $100M built you an entire fab. It costs GM about $300M to remodel an old assembly plant. They can either go out of business because 2022 chips are unavailable or build their own fab. Hmm I wonder what they'll do?
The nice part about building an older gen FPGA is it quite accurately emulates an older gen chip, usually using a lot more power and requiring a lot more silicon, but at least it works better than "next estimated shipping date 2024"
