[ls612]

It's gonna be a long while until we reach that point. For comparison, there are roughly 10000 airplanes in the air at any given time in a 5 mile band above the surface and the skies are pretty clear outside of some congested airports. In orbit you have the advantage of 3D, where satellites can be in a band a few hundred miles thick. Unless someone goes and intentionally creates vast quantities of uncontrolled space junk I think LEO won't have too many issues.