Yeah, the Technological Singularity is a pretty depressing subject too...
I'd like to think that all the worry about stuff like that is analogous to people thinking the end of the world was nigh during the Black Death. I'm sure there are other examples where many people thought we were done for but I'm not too keen on history these days. We've been through a lot of bad stuff and we're still kicking, so it is my belief that we can make it through future problems too. Every day that a comet doesn't strike, our technology improves making future collisions less of a concern. The longer it takes for a disaster to strike the more prepared we'll be for it, you know? It sounds pretty religious now that I'm typing it out, but I have faith.
To be honest, I think our biggest threat is ourselves. The most-likely culprits would be war and ecosystem collapse, in my not-particularly-professional opinion. Either us, or a supervolcano. That shit would be
baaad--I live pretty close to Yellowstone
. Wasn't the human bottleneck caused by some Indian supervolcano?
I have a lot of faith in the ability of humanity to survive a catastrophe, but the concern is
civilization surviving, huh.