With no treaty in effect, nations could resume testing nukes at any time. This would cause a major arms race. The risk of nuclear terrorism or accidental launch make nuclear disarmament a very crucial goal for all nations. Japan wants to work with the United States on ending nuclear testing and building a world with no nukes.
The cause of global nuclear disarmament, once a dream with geopolitical cred, may wind up entombed in eternal apathy. As Carroll put it: "Nuclear abolition itself is being abolished." But I refuse to believe that. What I do believe is that change of such magnitude simply cannot emerge from the actions of top-down leadership.