re: What should be done about workers who get displaced by technology?

The traditional answer is new jobs will arise to replace the obsolete one. It's arguable that there's been a paradigm shift and that will not be true going forward. So your question is a good one, and no one knows the answer.

Optimists will say it will be a new age of abundance, no one will have to work, and everyone will be free to pursue their leisure interests. I hope so, but I'm a bit skeptical. I think there will be a lot of social dislocation as this sorts itself out.