Superheroes is a bona fide genre now, and won't die off any time soon. How many flopped rom-coms have there been? Spy thrillers? Disaster movies? They all still keep getting made...why not superhero movies? The IP is not limited to Marvel and DC, needless to say. And btw, apart from the Avengers, we have a new Batman and a new Superman still to come - either of those hit big and it's off to the races again.