Cinematically, we seem to be running past the point of recognizable superheroes, i.e., those characters with a large enough pop culture profile and a long enough media history to make them broadly marketable. Superman first appeared in 1938, and Batman followed in 1939; both of them soon expanded from comic books into radio, TV, and movies. Captain America and Wonder Woman came in 1941. But Spider-Man, Ant-Man, the X-Men, the Fantastic Four, the Avengers — these are products of the 1960s, and they've seen varying degrees of success in their attempts to enter the cultural mainstream. Their stories and supporting characters are less well known, which makes them potentially much more confusing and alienating for what we'll call the average moviegoer: someone with a passing acquaintance with these characters, but not someone who reads (or grew up reading) the various comic books that detailed all these characters' cosmic adventures. When the Joker shows up in The Dark Knight, we're able to call back to Jack Nicholson, Cesar Romero, even the voice of Mark Hamill; when an interdimensional being uses telekinesis to build Egypt's pyramids in a post-credits stinger, we have no idea what is happening. I wonder if there's a point past which the audience won't be able to keep up with the studios. Maybe it makes sense, in a way, to keep "rebooting" the popular superhero franchises every 10-15 years. They've got the momentum.