Although this will not actually happen, what needs to be acknowledge is that masses of Americans are angry, fed up and so unsatisfied with the state of their country that even the very idea of secession crossing their minds in a somewhat serious sense really says something. I invite you all to thank about that. In light of all the unrest in the Middle East and Europe, will the US be next? Although I am not sure I believe in it, if karma comes around, we (being a US citizen) are fucked!
Consider this – think of how many countries would adore to see the US crumble? There is a lot of hate out there in the world against Americans for one reason or another. So then, even if we do not physically get attacked, reverse economic sanctions and trade disagreements are very possible and probably pretty darn likely. In other words, who would want and then take action to help or bail the United States out?
As stated, no part of the US will successfully secede, but that is not what is so important. What is key to recognize is that Americans are dissatisfied on a large scale, and so much so that petitions for secession are being signed by the thousands.
Therefore , it is the idea, not so much the action, that is of significance here – think about that!