It's not just the satilite's you need to worry about try and put 10x the crap into orbit and suddenly the 300,000 pieces smaller than 1 cm below 2000 km altitude becomes 3 million. (It's paint flakes etc.) Which dramatically increases the amount of shielding required to survive the sand blasting and further increasing tiny junk up there and eventually the required shielding may become untenable.

Now, at some point clearing space junk is going to be worthwhile, but I think we are still a long way from that point.