Mini-factories in space could become a thing, supposedly a lot of industrial processes are only difficult because of friction and gravity.
Like what if steel were cheaper than plastic? If there was enough of it around to build a bridge between New York and London? If you could build a ship the size of Manhattan and then a city on top of it to roam the oceans? If you could build entire cities in orbit or city-ships that slowly wandered the solar system.
Returning bulk products to earth might not be viable in the short term, but this could really bootstrap what we do off planet and I'm hopeful it might eventually make space elevators viable which would open a lot of options.
I hope to see in my lifetime a large asteroid brought to Earth orbit, for both mining and as a very large space station.
Think of all the science you could do with asteroids! Peer into the early history of the solar system . . . see what precursors to life existed before Earth was habitable. . . and all people think about is how fast they can strip-mine our extraterrestrial heritage. . . All that belongs in a museum!
/s
Here’s a great place to start: https://www.factoriesinspace.com/