There is something called the Kessler syndrome, which hypothesizes that once you get a certain rate of collisions and debris creations, you create a kind of death spiral, an ongoing cascade of debris, which eventually destroys the orbit where this is happening. It's indeed possible that we're in the early stages of this Kessler syndrome already and that in some altitudes, some orbital shells, we've gone beyond the carrying capacity and we will eventually lose access.
However, we need to combat that by insisting that satellites are capable of withstanding small debris hits by having redundancies and by having shielding, that they're built to last and that they're built for the conditions of space.