Probably not. Even 500,000 sattelites would still leave more than enough space between them for whatever you want. The risk would be if many of them blew up or

Probably not. Even 500,000 sattelites would still leave more than enough space between them for whatever you want. The risk would be if many of them blew up or something, creating billions of tiny pieces of debris. In that scenario, we might just wait 5 years and then most of the debris will have burned up in the atmosphere. SpaceX satellites are around 550km attitude. If someone puts satellites higher than that, collision debris will last longer, the satellites' fuel will last longer so the satellites won't have to be replaced as often, but network latencies will be higher. Seems like 500-600km is the optimal zone for the primary constellations of internet satellites. Video showing decay of debris vs. its altitude. The "X" shape is because each debris is plotted twice, once at it's perigee and again at its apogee (describing the ellipse of the orbit as they generally are not perfectly circular) https://www.youtube.com/watch?v=mQT5aMa_7iI https://www.youtube.com/watch?v=mQT5aMa_7iI Higher altitude satellites would be a bigger concern but these aren't a big deal.