From a practical point of view, it's likely that much space law will be decided by the countries that send stuff into space. That seems reasonable since they have a clear vested interest in protecting their citizens, the possessions of their citizens and regulating the activities of their citizens.

That's not really imperialism, just a matter of responsibility. Clearly the US and any other space going nation should be held responsible for the activities of it's citizens and enterprises in space as elsewhere, and has responsibilities towards them as well.

Where that line of reasoning reaches the end of it's tether is when we come to consider property rights over pre-existing assets and territory in space.

staticautomatic isn't saying the US system should necessarily be dominant, they're just pointing out that the two systems aren't mutually exclusive.

I’m not saying they are, but it is a question that presents itself given the context.

I'm not saying it should. I'm just saying that we don't face a choice between one or the other.