Just as a reality check, one of the big dilemmas is that while countries like Europe and the U.S. still have border protection that can implement supply management, developing countries have very little border protections or controls of any sort. The WTO forced them not to increase any one.... And their access to funding for development is also based on the removal of any barriers.
It's not that we don't promote supply management, it's that the rules at the international level do not assist any other countries--other than those who are in the same situation as we are, the big ones--to actually introduce it.