An asteroid or a supervolcano could certainly destroy us, but we also face risks the dinosaurs never saw: An engineered virus, nuclear war, inadvertent creation of a micro black hole, or some as-yet-unknown technology could spell the end of us.
The reading public is intellectually adolescent at best, and it is obvious that what is called ''significant literature'' will only be sold to this public by exactly the same methods as are used to sell it toothpaste, cathartics and automobiles.