Thought this was pretty interesting and entertaining. Made me dream for a while about what living in a society with a mature library economy would be like. Figured I'd share and try to get a discussion going. Enjoy!
I think hobbyist communities are also a good starting point. For example a bicycle community sharing bikes/tools/accessories. All it would take is a handful of people with an interest in common to get a private X library going.
As a librarian who has done some of the exploratory research into starting a local asset-sharing collective, LendEngine is useful, intuitive, and pretty cheap. I have not found anything FOSS that does the equivalent, but any programmers that want to help the movement, have at it.