That's one interesting questions that I've wondered since the day I've decided to write this article. The answer is, I'm not sure. I don't think a complete extinction is possible unless there is an event which occurs in the future that wipes out every single thing on the planet like what happens to the poor dinosaurs. Eventually, if Homo Sapiens is meant to be obliterated, it can mean either, the world's destruction or the earth will be taken over by an alien species, or another new Homo would appear. Whatever it is, life will always find a way.