Share: Moviegoers were first introduced to the idea of a summer blockbuster in 1975 when Steven Spielberg’s seminal “Jaws” was released, leading lines out of theater doors and raking in an all-time astonishing number of $100 million at the box office. Nowadays, these numbers shoot off into the billions and are much more common, but movies have begun to sputter and fall flat, which begs the question: What happened? It’s clear that the demand for movies, both new and old, continues to be high, but …