@dx #Vienna provides a practical plan for how to get to that point: around half of residents have a 1€/day "Jahreskarte" year ticket, so we already have the feeling of transit without tickets. This has been expanded to the #Austria -wide "Klimaticket", which is the same idea, but for all railways and public transit in the whole country. I think this approach is much more politically possible than trying to just flip systems to have no fares.