But the question is, does Patreon, OSS grants and the like scale to the entire population of a country? My instinct is "no". Yet it's likely that a lot of people will be looking for alternative means by which to live life within our lifetimes, and no-one is really looking for broadly applicable answers.
But once you get to more or less full automation, the only people who would make money under the current system would be the owners - there wouldn't need to be any workers.
I think things will change dramatically if we can solve energy scarcity. Much of our wealth in society is based around the availability of resources. What people forget about with 3D printers is they still need oil; and you can't (easily) print circuit boards. Humanity needs something on the level as replicator technology from Star Trek.
I want to believe, but I don't think that type of alchemy is feasible; at least not until we solve the energy problem. A breakthrough in LENR or tokamak fusion reactors could change the world dramatically.
Ya, some form of Stalinist USSR, Maoist China or Pol Pot's Khmer Rouge.