It is always possible to renegotiate commitments made in a WTO agreement, whether it's plurilateral or multilateral. However, we must not forget that the member states consider it a privilege to be part of the WTO. Its members are in an exclusive club. When you withdraw privileges from a trading partner, the WTO expects you to negotiate with them and compensate them if the withdrawal or change in commitments costs them money. So it isn't easy.
