So if you fail to reproduce you will break that billion year old chain of evolutionary success.

All your genes are in other people and will continue without you. And your unique configuration of genetics is lost like a droplet in a river. Only around one in a billion people really put their stamp on our genealogy -- and you really need to rape, murder and empire build like Genghis Khan to achieve that kind of thing (and as the population expands it likely gets more and more difficult).