Very low probablility that one sub-system is affected, while all other semiconductor sources in every other vehicle sub-systems are secured. There's either a chip shortage or not.
Nonsense.
In the first place, "chips" is a vast array of different products. You might as well say "Hoses" or "Clamps". For some tasks you can use a fairly basic micro-controller. For others you are looking at complete processors similar to what you might find in a smartphone.
Most of the chips in cars are used are for extremely basic functions. "When the temperature exceeds 200 degrees and this valve is open, turn on this pump".
Supercruise is a whole other problem set. You can't just run the Supercruise on the same microcontroller the fuel pump uses.