The best case seems to be to try to make a deal with a couple of major spacefaring countries that are in principle open to the principles of the free market. A multilateral treaty between ESA, Japan, Canada and the US e.g. could change things. But especially the Europeans will probably be wary.
Space law remains in a great crisis.
The best we can hope for from the most democratic legislatures is that they will generally support majority interests in their countries. The space community is a tiny minority everywhere. We are sometimes influential beyond our numbers, because space development is seen as important to the future, but we cannot expect to prevail very often against larger national interests. For example, it would be very difficult to get the US Congress to withdraw from the OST, or to initiate conflicting agreements, because doing so could damage relations with many nations that are important to us for strategic or trade reasons. These issues, unrelated to space, are considered much more important than anything wanted by a few nutty space enthusiasts.