I don't think its a matter of disarming nuclear weapons, but completely disarming the entire military. Nuclear weapons are a bi-product of modern physics, and science will always be integrated into militaries along as there is a military/war.
We must first dis-associate the idea of war from the human race before we can disarm nukes. You must learn to walk before you can run. With this said, we must disarm our entire military before we can destroy our WMD.
A utopian worldwide society must be achieved before we can think about disarming nukes. Until this day, having some nuclear warheads backing you up is like having Mike Tyson behind you in a bar fight.
The question is how can we rid violence and war from society? This is the problem we must tackle, because nuclear weapons are a product of power and violence.