Most regular superhero books are designed to go on forever; of course, very few of them do, but the point is they are trying to throw mud against the wall and hope it will stick, and most of it slides off.
I had a great drama teacher, and he sort of made out drama school as this incredibly difficult thing to get into: 6,000 people apply every year, and some of the schools only have 12 places. It's a phenomenally difficult thing to get into. And that excited me - I wanted that challenge.