I don’t know if it changed Hollywood but it sure changed the beach!
Related:
40 Things that Wouldn’t Have Happened Without Jaws
http://www.vanityfair.com/hollywood/2015/06/jaws-40th-anniversary
It invented the summer blockbuster. Prior to Jaws summer was a dump zone for movies they didn’t like. Then Jaws hit. Then Star Wars did it and proved it wasn’t a fluke. And now it’s when the industry makes all their money.