Great topic. My talk at BTC Prague was in this vein (https://www.youtube.com/watch?v=4YwqTG9xtKQ). The three groups are a good start, but we can push much further and look at income-level categories around the world, prioritize use cases based on impact, estimate efficiencies tech improvements will bring, etc, and then construct possible futures from that. My talk was not about finding final answers, that would require a much more comprehensive effort (which I'd love to see), but about digging layers deeper than the conversations I've seen happen. More of this please.