[MackSteelPrivateEye]

Originally Posted by Nothing like an SS

Except nobody can build when the basic electronic components (memory, processor, micro, linear parts etc.) are all obsolete. The design is then useless as the parts will not be available. Again, this is an electronic fact and reality.

I could build a body control module from a 1996 whatever brand today, in theory, schematics and everything available, except 90% of the necessary parts to build it no longer exist. Also, far simpler modules in 1996 than today, and fewer of them in the car back then! Today's electronics far more embedded in every car.
Updated replacement parts would not function in the old design, so now you need to redesign the entire module and system to "recreate it", test it, work out all the design bugs. Not going to happen. You would invest millions to build aftermarket modules and not enough market/demand to support it.

Nope, not going to happen.

This is what I do for a living everyday for multi billion dollar companies, redesign and move on. For old electronics in automotive, it would make zero sense.

Then perhaps they will do the way they have been doing 50 or 60 year old airplanes which is to completely upgrade the electronics with new systems while maintain the original infrastructure, mechanics and hydraulics. Perhaps someone will come out with electronic upgrade kits. Perhaps chip and CPU manufacturing will become very easy to manufacture and better than stock system boards will be made available.