> I'm assuming that powering them down isn't a viable option

Sadly that might be assuming too much... here and on reddit I've seen a handful of people who have said that we should continue with AI progress even if it causes the extinction of humans, because we'll have ~"contributed to spreading intelligence throughout the universe and it doesn't really matter if it is human or not."

With that as the extreme end of the spectrum, I suspect the group of people who simply aren't considering what happens to obsoleted humans is much larger, and corporations certainly haven't demonstrated much interest in caring for those who technology has obsoleted in the past.

Tbh it is really disheartening to see so many technologists who seemingly only care about technology for its own sake.