Upload & Sell: Off
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.