That has been a big problem with the recycling movement: price collapse of junk.
As a market develops for used coke bottles and their plastics, more people recycle and the supply becomes huge to the demand, crushing those who are trying to recycle.
One good sized iron asteroid would supply humanity's need for steel for many centuries.
The economy of scale is such that it would have to be a huge enterprise and would have to be supplying steel and iron alloys at such low prices as to shut down every iron and steel operation on earth.
What do we do with the laid off workers and lost capital of the losing enterprises?
The disruption would be massive.
It is so complex.
Ed