Humans could live in giant “cyclers” basically Oneill cylinder space stations that travel on elliptical routes between any two planets over the course of years or decades, and act as a way to transport huge quantities of goods through the solar system cheaply (though slowly). Say a 2 million population Cycler, named the State of Kennedy, 2x2x6 miles in size, flying between Jupiter and Earth (the distances would change constantly) for a couple decades and then arriving and orbiting each for a two year trading/vacation stint, before plunging back into the depths.