We are already in some sense past the threshold of sats required for a potential civlizational collapse that would be caused by the loss of access to space. There are way too many sattelites, starlink militarizing means it's a viable target now for enemy nations, any one of them taking out a couple sats and causing debris would cause a chain reaction that would effectively turn space into a dump, let's not even menti…
You may not realize how big space is relative to the size of a few sats.