Don’t be too sure about that. Back when people who listened to Art Bell were certain that the End of the World™ was just around the corner, one of them called a credit card company to ask what they would do if it was announced that a giant something was going to wipe out all life on Earth. The credit card company said that they’d let people rack up all the debt they wanted to since it wouldn’t matter if we did all get wiped out, and if we didn’t get wiped out, then someone would have to pay back the bills. Additionally, they said that they kept back up copies of their records in old missile silos, so that if the disaster wasn’t completely catastrophic…
That was my first thought. Assuming things would be like the Fallout series afterwards, where I can carry around all the guns I want and form my own little Empire in a post-apocalyptic wasteland, sign me up!