I think this is a very interesting topic, I've been thinking about it lately. Not so much as if it could happen, but what would happen if it did? Can anyone recommend some literature on the subject?
I personally think it still can happen. A renegade nation like North Korea that doesn't have much to lose. Or maybe Argentina...
A better question would be if the US would still be commited, the way the people of this nation are and the media I don't know