Great book by Orson Scott Card, called "Characters and Viewpoints" its a book all about writing, and he points out that it seems to be a regular cycle where stories are created and become popular that are about normal people doing amazing things, and then the power level gets amped up, and moves to super powers and super threats, and things keep growing until everyone starts to suffer from fatigue at seeing super powered people do super things, and then normal stories about normal people came back into vogue and then things repeat.
