I think if we are not ALL destroyed in whatever the first apocalypse is, then we are likely to experience many of the ones people have imagined in the past, over time. We are basically in the middle of a Soylent Green overpopulation apocalypse already, although it isn't quite at that point yet in the countries where any of us live. Nuclear war betweet Pakistan and India is QUITE likely, and that would kill a hell of a lot of people outside of those countries, supposedly, from radiation, nuclear winter, etc... also, some people seem to think the Arctic permafrost is already giving up its methane, which accelerates global warming bigtime, so... that sucks. Also, think about the Tunguska meteor a hundred years ago. If anything like that happened today, there's an excellent chance some nuclear weapon armed country would consider it an act of war by some unknown adversary, so... kaboom.

I think, if you believe that humans are likely to remain roughly comparable to humans today for a few hundred thousand years of evolution into the future, or even a million years, then you could say that that means we have hundreds of thousands of years to experience all the apocalypses we can create, or can be randomly subjected to by Nature.

nanobots and artificial intelligence scare the hell out of me. In a way, watching horror movies is probably one of the best ways to prepare ourselves for the kind of things that will become possible, as thse technologies evolve. Nanotechnology makes things possible that we will have a very hard time mentally processing, because it will look like magic unless we have spent decades in school trying to understand the science behind what we will see happen. Like, rocks turning into what appear to be animals or robots, or people changing sex, or mists that can reprogram people's minds, or.... just anything we can imagine. Nanotechnology is not magic, but it might as well be. A lot of people will go out of their fucking minds if that kind of thing starts to be commonplace. And, if the nanotechnology is guided by inhuman artificially intelligent entities... anything could happen. We would have trouble even imagining the possibilities.