Comment by BWStearns

Realistically I think the result would be a more civil version of the diamond market. Since there are only a couple players who could bring back anything you would just park your supply in orbit and bring it down when it was profitable. You'd still lower the prices but how much you brought home would be ceilinged by the total market demand. You'd probably bankrupt literally every terrestrial mining operation which wouldn't be the worst from an environmental and quality of life standpoint.