How did you come to that conclusion? We've got reusable rockets, probes that have left the solar system, retrieved samples from an asteroid, and had people spend over a year in space already. There are many companies building different models of next-generation space stations and lunar landers.

It's nowhere close to the leap required to get to bitcoin from ancient Rome. Given all the technology we provably have and the tech we're confident will be available in just the next 5 years, what major barriers do you think will prevent us from having permanent settlements off-Earth?