Even when their orbit starts decaying they're not generally a direct threat to other satellites as long as they can maneuver. The US maintains a pretty good tra

Even when their orbit starts decaying they're not generally a direct threat to other satellites as long as they can maneuver. The US maintains a pretty good tracking network that will pick up any whole satellite at least once every few orbits. On that timescale there's not a significant change to the orbit of an object so they remain pretty predictable out far enough for a maneuverable satellite to make a small change to avoid a collision.