When will total worldwide nuclear disarmament occur?

Currently, there are roughly 12,700 nuclear weapons in possession of the nations of the world. This number has decreased substantially since the height of the Cold War in the 1980s, leading some to believe that dismantlement of all nuclear weapons worldwide may occur sometime in the future. Formally, Article VI of the Treaty on the Non-Proliferation of Nuclear Weapons (NPT) commits all declared nuclear weapons states to work towards general and complete nuclear disarmament under international control. Numerous organizations exist to promote this objective, and the topic frequently comes up at international summits such as the Reykjavik summit in 1986.