There is a major problem with asteroid settlement. Even in the best of situations, which is a mile or two wide asteroid that has cleared the neighborhood, so to speak, you have limited resources. I do not mean oxygen or nitrogen or methane by this. I mean the metals and fuel needed to sustain a long-term colony that needs repairs, new vehicles, and spacesuits every few years. Once the metals and ores run out, we will have to develop a way to either synthetically create plastics, or abandon the colony. There is probably one exception to this, and that's an asteroid field. But, i have no idea how you attempt even a landing there, what with the chaos going on.