Does the DSM need support from ongoing negotiations?

Jeff Schott worries that the WTO’s dispute settlement mechanism may be less effective if the dismal prospects for future negotiations cause dispute panels to expand their coverage:

Of course, WTO members will still be bound by existing obligations and the heralded dispute settlement system will continue to function. But past success is not a guarantee of future performance. Disputes undoubtedly will arise over “gray areas” of WTO law. Without the prospect of new negotiations to update and clarify the WTO rulebook, panelists will be tempted to bridge the gaps in their rulings. That is the danger: If the panelists attempt, or appear to be attempting, to usurp the powers of WTO members by interpreting and possibly expanding the scope of WTO obligations, it will likely trigger a political backlash against the WTO and discourage national compliance with such rulings. Members of Congress already think this is a problem with regard to the numerous WTO rulings against US antidumping practices. Over time, the frozen WTO legislative function will erode political support for compliance with the judicial function of the WTO