This is presented like its crazy but once we make launching cheap enough to become comercially viable this is how people will live in space.
They will primarily be conducting low g manufacturing (some stuff is better built in 0g) Tourism, mining of asteroids and other rocky bodies, R&D, and possibly even energy (if we can find a way to transfer down to earth effectively)
People dont like nuclear and building a solar aray large enough is tough on earth but in space.......
The commercialization of space seems like science fiction but it will be happening A LOT sooner than people realize.