I already feel the edges of this. I can SSH to a server and fix it, is no longer a skill that's as in demand today, with everything running in a container on a kube pod. It's still useful here and there, but it's no longer the central focus it once was in my toolbox/grimore.

That thread yesterday about two sticks of RAM making the computer faster made me feel like my knowledge is still relevant but those moments are fewer and further between.

I think the opposite is true. The people who need to worry are those that know only the most popular technologies, for which documentation and examples are readily available. The people who know the stuff that's not written down anywhere are the ones who are safe.

If all you do is crank out React code, you might want to start learning new things. If you know how to do RCE or are a networking wizard, on the other hand...