The jobs available in the post-robotic-revolution world and the necessary skills haven't yet been thought of. Once upon a time, most people were illiterate.
Most people were illiterate in the past because they didn't go to school. I don't think it makes sense to assume that some magical force will make people useful for non-automatable tasks in the future. Unless we achieve major breakthroughs in education, a large portion of society will be less capable than cheaper robots, and will therefore be unemployable.
Most people didn't go to school because they worked in agricultural jobs that didn't require education. In 1870 half the country worked on farms [1]; today it's <2% [2]. From that statistic alone you can see that half the country has been educated for new jobs over the past 140 years. Market forces aren't "magical"; they're real and they work. I don't think it makes sense to assume market forces will magically stop working in the future.
What's the difference in the marginal investment required to go from illiterate to literate vs. uncreative to usefully inventive? Assuming that the market will get you what you want because it got you something else you wanted before is dangerous and wrong.
