That is definitely an interesting thought. I like to think so. I mean, if we, as writers, didn't feel like we had something original, we wouldn't necessarily put ourselves out there. But I also agree with what some others have said about pre-existing concepts. If you really think about it, if you're an avid reader, you almost can't help but read different versions of ideas that draw you in. I think it is part of the reason you'll see so many different versions of (for example) someone becoming a main character in their favorite book/series. (I know there's a word for that genre, I just can't remember it right now. lol.
) I think what makes a story original is not necessarily something new, but the way in which the story is conveyed, or the way the characters tackle their issues.
Any hoot, here are my stories! I can say, confidently, one of them is a homage to my love of superheroes, and the other has an original pantheon! 