Of course there are things that can be done about it, at least by a handful of superpowers back here on Earth.
If any of those powers see this as a big enough threat (and this is a pretty big if), they have the political, economic, and military means to take action. Since there is no practical means of doing this in space, any actions would be between the nations of this world.
At face value, I don't think that this is going to be labelled as a big threat simply because the cost of the exploitation of space is going to be prohibitive for the foreseeable future. That being said, that prohibitive cost also makes the economic exploitation of space suspect. It wouldn't surprise me if many nations see that suspect behaviour as have short or long term military objectives.