I don't think we will get to that, because I think humans will adjust their thinking as events worsen. But perhaps I am underestimating how engrained the mindset is that believes in government.
If we say gigadeaths, most people would dismiss us as kooks.
In any case, the features we need in a better crypto-currency have far reaching synergies in positive ways such as micro payments and fostering new paradigms in knowledge and social interaction on the internet.
So we don't need such a dire scenario of Armageddon, in order to drive a desire for a better crypto-currency than Bitcoin.