How many films and books have been about the end of the world? Whether it's a zombie apocalypse, Mother Nature teaching a lesson, viruses, alien invasion... we've seen the world collapse and society die in a million and one ways.
Like found footage films I'm a sucker for end of the world type films. I actually think it can be used for great character development. Seeing people who probably would have never said 'hi' to each other on the street working together and I love it. It's interesting to see how people will suddenly work together to survive. You get the complete opposites working together. Survivors in the most unlikely characters.
And there's so much to get used to. The end of the world can take you back to basics. No technology, no way of contacting others, finding your own food. If there are illnesses soon enough the medicine we use now will go out of date or we'd run out. What happens then? Maybe turning to more natural remedies for help and learning how to hunt for your own food. But the question is: would you manage it? Could your characters survive?