Whenever I think about the prospect of the end of civilization, via a plague or climate change or what have you (and I agree, the population has increased too rapidly for the Earth to support -- something has to break), I'm always a bit torn. On the one hand, as many other posters have said, "Good riddance." There are too many people, who cares if they go away? On the other hand, think about how terrible it would be if you or someone you loved were affected -- either your whole way of life changes, or you suffer terribly before you die. Either way it's no fun.
So, not having RTFA, I'd rather see someone look at mitigating the effects for individuals rather than trying to prevent some cataclysmic occurrence. Or maybe just happy drugs -- or euthanasia drugs -- for everybody.