I would happily stake all of my camera gear on the continued existence of the world for many billions of years, as I would on the fact that it was here several billion years ago. Now as for human civilization, even as little as a century from now would be anyone's guess considering our progress in nuclear bombs and germ warfare, but December 21 based on poor interpretation of the ancient Mayan calendar - give me a break.
But Jefferson, I do suggest a 1DX and 28-300 L for any taxing and unpredictable photo ops that may present themselves. Best to be prepared for the unexpected. Not wanting to buy any more lenses, I will load my backpack with 1DX and 70-200/2.8 II, 2XIII, 5dIII and 16-35 L II, 15 fisheye, 24 TSE II, 24-105, 85 L II, and a 600 EX-RT system, with tripod strapped to the side. Zombies, honey badgers, saxophonists, crevasses, cyclones, lawyers, or high school seniors, I'll be ready. If I encounter any soccer games or Ross gulls I may have to run home for my 300.
When the electromagnetic pulse hits us and zeros out all of the ones, or vice versa, all devices based on electricity or magnetism will cease to work. Copy everything in advance to a non-magnetic media like a DVD and hope that someday, someone can get a reader to work again.
