I don't think people in general are willing to fight another Civil War, and would have difficulty doing so without the Second Amendment (since another civil war would be guerilla warfare, very likely, everyone would be a minuteman).
That doesn't mean I don't think there will be secession movements -- I think California may be on the way out of the Union.
If that happens, all California's federal programs will need to be pulled, all water and power cut off, and all installations, bases, and facilities closed.