> We have millennia-old assumptions about peoples' relationships with work (that there will always be useful work for people to do, making it fair and reasonable to structure a society where everyone who can work must) that are about to become invalid

This makes no sense. Work can be categorized as either creative or non-creative. Computers, software, robots, etc. are destroying the demand for non-creative human work. Great! Every person who loses a non-creative job, ends up finding a creative one! Machines are incapable of doing anything genuinely creative and in my humble professional opinion, will never be able to.

That leaves all the creative work for us. And the fun part? The creative work market is only limited by our imagination and our imagination is truly infinite.