There are many other factors to consider here. The effect this proposed disintegration will have on the world economy and global stability. Think what you will of the US in regard to failed foreign policy and corrupt politics, but they remain an obstacle in the path of other nations like North Korea and Iran for example, who demonstrate extremist ideologies/agendas in regard to government and world politics.
Without the possibility or concern of U.S. intervention, militarilly or in the form of economic sanctions, the world stage may become quite a scary and chaotic place.
And correct me if I'm wrong, but there has never been to my knowledge any nation to have done this peacefully. I have always thought the U.S. to be a tender box in regard to it's capitalist economy and multi-ethnic population. The conditions there are now prime for similar events that occurred in the former Yugoslavia.
If there were an actual disintegration of the U.S. a civil conflict would more than like occur (as we've seen in past history) resulting not only in massive human loss, but overall instability of the free world.