If you're that dependent on components that there is no replacement for, then perhaps buy enough stock to last you through a redesign and recertification is in order. Having a contingency plan for such scenarios seems like a no brainer.
I got all my electronic parts on time for my private development and first small manufacturing run. It is indeed no brainer.
This doesn't mean they should go out and build their own gas peaker plant.
We live in a society, and no man is an island. You can't control everything you depend on. Sure, you can control some things you depend on, but that's a long, and expensive rabbit hole. Hoarding twenty years of canned food and seventy thousand rounds of ammuniton is all well and good, unless doing so puts you in a situation where you can't pay rent.
That is because it's a utility that source power from several producers. The risk of no power what so ever for a prolonged time is not something to even be considered. Should that happen, society as we know it is probably at risk and my job is no longer important at all. Oh, and someone actually do plan for intermittent power delivery failure including having two different outside sources for power, a battery backup and diesel generators, data centers come to mind.
And if they intend to feed the generator in perpetuity, I'll happily shift the goalposts to some other critical supplier not providing their services.