Can Kelsen's legal positivism account for international regime change?

In this discussion I will state fundamental principles of Kelsen's Legal Positivism in International Law and explain four problems with his theory. I will then propose two suggestions in the light of which Kelsen's theory is modified in this discussion and explain how these two suggestions address the four problems and help the theory account for regime change. Finally, I will address possible objections to the view advanced in this discussion.