I wish they were right because it would be awesome if all religious fundies were taken somewhere else. Too bad they often aren’t good people and many, if not most, would end up being left behind. Imagine the tantrums when they realize they’ve missed the rapture. I bet we’d see a rise in Satanism that wasn’t just a front to challenge Christian bias in religious rights but instead a rebellion against a god that spurned them. And then I wonder if they’d be surprised that atheists still want nothing to do with them.
The human species will not end, we are way to many people for that. Even if 99,9% of people die, the remaining 8 000 000 people are more then enough to allow for stable populations even if those 8 000 000 are spread all over the globe in smaller communities.
Even a nuclear war is highly unlikely to eradicate the human species as a whole, the sheer numbers of human beings makes us, as a species, extremely resilient against extinction.
That should not be understood as me saying that we can do whatever we want, not at all. On the contrary, we should do a lot to restore the damage we have done to the earth as fast as possible, or at least reduce the amount of damage we still do to zero if possible.