I saw that video.. You'd be surprised how much space is available up there. I mean, with as much crap that up there. We hardly ever hear anything colliding with one another that's important. Or that much shit is interfering with the constant rocket payloads being sent up to the ISS
There would have to be SO MUCH shit for it to actually block the ability to traverse it, though. I mean satellites and other objects are each quite small compared to the amount of space out there. It's like the asteroid belt, the common conception of it is that it's a minefield of rocks, but in fact, due to the sheer amount of area, they are scattered widely, not really in view of each other, even though there are a lot of them.