Perhaps the planet gets so hot that human life can no longer be supported or we all die in a nuclear winter! Perhaps the human race goes extinct in a global pandemic or from a massive asteroid striking the earth like the one that killed off all of the dinosaurs!
Perhaps humans will be replaced by smarter artificially intelligent robots or from the invention of some miracle chemical whose unknown side effect is that it neuters the race! Perhaps a superior race of ET aliens discover the earth and eventually win the war of the worlds! Will see or not!
And that is all I’m going to say about that!