>We may end up with at least one generation of people who are like the Eloi in H.G. Wells’s The Time Machine, in that they are mental weaklings utterly dependent on technologies that they don’t understand and that they could never rebuild from scratch were they to break down

I don't think this can realistically happen unless all of the knowledge that brought us to that point was erased. Humans are also naturally curious and I think it's unlikely that no one tries to figure out how the machines work across an entire population, even if we had to start all the way down from 'what's a bit?' or 'what's a transistor?'.

Even today, you can find youtube channels of people still interested in living a primitive life and learning those survival skills even though our modern society makes it useless for the vast majority of us. They don't do it full-time, of course, but they would have a better shot if they had to.