@loko @sundogplanets One <1km pass every 30s is for the whole globe and the whole constellation of thousands of satellites, the density at any given place is still one per several hundreds kilometers or more.
Even if this escalated to constant collisions between sats and debris (Kessler syndrome) , a object ascending through this orbit could still pass through with no trouble, a single object would have to spend months in the orbit before the probability of impact reaches 1.