...the Law of Treaties will become more important as a method to resolve potential conflicts between treaties. But I think the biggest change will be (and, again, may already be beginning) with respect to customary international law. CIL has been a useful way to bind states when there’s no treaty or the treaty has less than universal membership, but after every country in the world belongs to
UNCLOS, what becomes of the customary law of the sea? When every country belongs to the Geneva Conventions, what becomes of the CIL...