I would not call superhero shows a fad. The CW's current group of superhero shows began over nine years ago with the premiere of Arrow, and nine years is a long time, contrary to the definition of "fad." Many viewers of those shows are lifelong fans of superhero media, including comic books and TV shows. I have been a DC fan for many years; however, I do admit that I have been leaning more toward Marvel during the past few years because of Marvel's high-quality TV shows and movies.All fads come with a sell-before date.