The microcontrollers in an ECU are built on far, far different processes to modern CPUs and GPUs. Microcontrollers are usually >90nm, and if designing for robustness probably a lot larger than that. These processes are optimised for many different things, but speed is usually lower on the list than cost, power consumption, and even lifetime (which the automotive industry are still extremely keen on). And given the strong (generally exponential) dependence such aging processes have on temperature, time spent in a low power mode while the engine isn't running as opposed to off is basically irrelevant as far as lifetime is concerned.
This affects servers, personal computers, and phones. That's pretty much it. <10 nm is only used for the applications most demanding of computer performance.
You know what the limiting factor on your phone and laptop's lifespans are? Because it's certainly not the CPU.
Even for the relatively narrow applications in which aging will have noticeable impacts, I doubt it will be a big deal. >90% of people will get a new laptop, phone, or PC long before they see clock reduction due to aging. There are plenty of people who are still on CPUs as old as sandy bridge, but even that is inflated due to the awkward phase where it seemed like parallel utilization would never improve. 15-20 years from now the number of devices using CPUs from the 2020s will be at least as small as the number of people currently using devices from 2010. Not that those devices aren't important, but "we're going to have very short-lived electronics" is just not true (or at minimum, it's already true).
On top of that aging in future processors will be a gradual reduction in performance and efficiency, not sudden failure, and it'll still take many years. Design issues are the real concern here; something like underspec'd AVX instructions that suddenly see massive increases in utilization. Aside from that CPUs will not be noticeably different, and the vast majority of consumer electronics and infrastructure will not even be on a relevant technology.
