Not quite the path I was interested in persuing.
I believe that if human kind were to disappear for most any reason, 'life' (like after any other mass extinction) would continue and other life forms would evolve to take our place. After all there are a few hundred million years left before the sun goes postal on earth (a few billion years from now).
So, why should we care if mankind dissappears off the face of the planet?
I'm too small minded to give a shit about that. I care about the more immediate future of passing along a livable life to future generations, because I have a daughter, and she may one day have kids (she may not, for that matter, in which case my concern would probably diminish).
It's easier to type the words "mankind disappearing off the planet" than to watch it. Evolution is jagged and messy, and we won't just go quietly into that dark night. We could suffer tremendous diseases, radiation waste conditions, overpopulation problems if the icecaps melting do in fact cause the available land masses to decrease.
Here's my personal belief part. I believe we are all born with the knowledge of good and bad. We know that some things feel good and some feel bad. Through growing, education and experimentation, we learn to control these dynamics. Socialisation teaches us which things fit with the society in which we live, but at the very most basic, most of us can agree that we like "good" things, although we disagree on what those things are, and we reject "bad" things, with the same disagreements.
To a primitive society, good things are mainly determined by needs for survival. As a society evolves, has more of its needs met, then desires become easier to address. Our society has been compared to Rome by some, and perhaps that's fair enough. Tremendous arts, literature, and music have come from societies that have the luxury of producing them, in fact, it's the majority of what we have to determine who they were. We have luxuries, and whether we fall, like Rome, will be largely determined by what we DO. Rome didn't fall passively, they failed to address obvious flaws in their thinking and behavior. A return to the dark ages isn't the answer, we need not model the past to learn from it. However, an unknown future, even a potentially good one, is a very scary thing. Most would prefer to bury their heads in fundamentalism, with a God who loves and supports ME regardless of who I am or how I act. Blanket bullshit, pure and simple.
If someone "drops the big one" and we all blow up, I won't give a shit, and perhaps that's no problem in the grand scheme of things. While I am alive, I WILL care, and do the best I can not to make my visit here a disgrace to those who left it for me to find.