Are you really certain that the federal government would send the military in to prevent a state seceding if secession was clearly the democratic will of the people of the state? I wouldn't rule out the possibility but I think it would be an unlikely outcome.
I'm pretty certain the federal government will not take the blow of a state leaving in the next decade, at least. They might be slightly more likely to let a quirky, small state like Vermont or New Hampshire leave, since clamping down on a tiny state would look bad, and the loss would be negligible. But then they would set a dangerous precedent for more important possible secessionist states like Texas (Texans are somewhat nationalistic, though also often super-american/patriotic), New Mexico (majority-minority state) or Alaska (active secessionist movement).
I would like to propose this as a thread for people to write in their predictions for the next year and the next decade, when practical with probabilities attached. I'll probably make some in the comments.