Benjamin Clayborne
Auror
This is true. And I disagree that there hasn't been much originality since the 1600s. I think there has been a great deal of it, in fact. You may have some basic elements at the core of various stories, but there is a lot of room for originality in the layers that you build upon those base elements.
I would say that most of the room for originality is reinterpreting old story elements in light of cultural/historical developments. The Social Network is a wonderfully original movie, even though the themes it deals with (ambition, betrayal, desire for acceptance) are as old as time, because it manages to so perfectly mirror our perceptions of the events depicted.