One easy way to tell if something is overhyped is when we starting seeing articles or blogposts saying "The next big thing after X", where technology X, itself,

One easy way to tell if something is overhyped is when we starting seeing articles or blogposts saying "The next big thing after X", where technology X, itself, not only hasn't arrived yet -- it's still in very much in its potty-training stages. In this case, X = self-driving cars.