As my initial comment implies, I think the last century is qualitatively different automation than before: before, the machines began handling brute force things, replacing things which offered only brute force & not intelligence like horses or watermills. But now they are slowly absorbing intelligence, and this seems to be the final province of humans. In Hanson's terms, I think machines switched from being complements to being substitutes in some sectors a while ago.

The key Hansonian concept is that replacing humans at tasks is still complementation because different tasks are complementary to each other, a la hot dogs and buns; I should perhaps edit OP to make this clearer. It is not obvious to me that craftspeople disemployed by looms would have considered their work to be unskilled, but as that particular industry was automated, people moved to other jobs in other industries and complementarity continued to dominate. Again the question is, what's different now? Is it that no human on the planet does any labor any more which could be called unskilled, that nobody cooks or launders or drives? Obviously not. But there are many plausible changes in regulation, taxes, phasing-out benefits, college credentialism, etc.

I'd pay $5/hour for someone to drive me almost anywhere if availability was coordinated by Uber, but not taxi prices. House cleaning and yard work is not possible for me to find at a price I'd currently pay ($150 can't pay someone to trim your trees, at least not well). I strongly suspect that things would have appeared otherwise to me in 1870, when maids etc. were far more common. This looks to me like a barrier-to-entry, regulatory-and-tax scenario, not "Darn it we're too rich and running out of things for labor to do!"

Unless you want to pin unemployment on changes in people's trustingness, there is nothing obvious about your stated fears of the IQ 70 kid which would have prohibited equal fear in 1920. More to the point, a change in this characteristic is not a change in automation. A few weeks of training may indeed be necessary - I'm sure I live in a high-IQ bubble but I try to be aware of this - but people managed to get jobs requiring a few weeks of training in 1920.

I would favor Basic Income, though I would favor zero taxes on the bottom 20% even more. But this has to do with my beliefs/model/worries about distribution of gains and negotiating power, more than a belief that unemployability due to machines outcompeting many humans at literally everything is the source of the Great Recession and possible Long Depression (though I'm not sure we can get properly stuck in a Long Depression while China, India et. al. are still growing).