U have a point there,but the majority of those people won't change opinion, unless something drastic happens... People don't bother with things like that, until it happens in their neighborhood or to a close person. .
By co-incidence, I just finished his book "A Short History Of Nearly Everything" on Friday, hence my head was fresh with the list. So while I think the odds of us humans making it in the long run are pretty slim, I also think it'll be mostly to do with other factors rather than our own. I forgot who wrote: "This is the way the world ends, This is the way the world ends, This is the way the world ends, not with a bang but a whimper." ~anyone?