Babylon
One important lesson: You can't stay at the top forever you either die at the top or live until you fall.
By the way, the film is a thank-you message to all the films and people who suffered to make cinema what it is today. Despite their small impact, year after year, the cinema we know was formed. And yes, the film confirms that those who make films never truly die their spirit lives on within their films every time someone watches them.