Space is big. Any orbital plane has a diameter of, roughly, 13000km. That gives a sphere with a surface area of about 5.3 * 10^8 square kilometers. We could giv

Space is big. Any orbital plane has a diameter of, roughly, 13000km. That gives a sphere with a surface area of about 5.3 * 10^8 square kilometers. We could give every satellite in a single plane 100 square kilometers and still put millions of satellites in it. From the perspective of a rocket launch through a plane that's pretty safe. But orbital mechanics dictate that satellites on different orbits have their orbits intersect in two points, obviously. So we need to coordinate Management of orbital planes such that the satellites' orbits in a single plane don't intersect with each other. That means, inside a plane we would have to create "subplanes", instead of a plane one would assign a shell. Capacity then depends a lot on how much space we want to leave. Say we want 1km "vertically" and 10km "horizontally" and a shell has a thickness of 10km. Then you can still put about 4000 satellites on the same orbit and have 40000 satellites in that shell at most. So there is a lot of space in space. But coordination will be crucial.