It's very true; any other Solar System body can't sustain a large human population with the lifestyle we've been used to. The rocky bodies are too small: Mars,

It's very true; any other Solar System body can't sustain a large human population with the lifestyle we've been used to. The rocky bodies are too small: Mars, the largest (Venus doesn't count), has a surface area about equal to the Pacific Ocean in size. Cloud cities on Venus or Jupiter require a level of technology we can barely fathom. And I've got a feeling that living on a space station makes those cages in Hong Kong look comfortable.