Mario, the fact is there are many approaches to "making it" in the industry.
You can think that you don't need film school to make it and you can throw some names of the exceptional directors who make up an extremely small percentage of all directors out there and I can throw you a list of directors who went to film school and made it.
This whole arguement can go on for centuries and the end is it is up to you to decide what you want to do.
Anyone can pick up a cheap ol' camcorder and shoot something but you talk as if there is no benefits whatsoever to be in film school. If there wasn't, these film schools wouldn't be in existence for such a long time and still be thriving.
Anyone can do quality work but it depends on how they operate. Some of the biggest and richest people in the world are college drop outs and high school drop outs. Should you now say you don't need to go to high school since it's not worth it?
Never forget: The names you put on the list are very exceptional people that have a mind that preferred something beyond school. Just because you go to film school does not mean that you can't study PHILOSOPHY on your own.
EDIT: by the way, just a notable alumni list from USC alone:
Elizabeth Allen - Director
Zeenat Aman - Actress
Thom Andersen - Film critic
Rob Kardashian - TV Personality
Judd Apatow - Filmmaker
Gregg Araki - Filmmaker
John August - Filmmaker
Kevin Bachus - Video game executive and co-creator of Xbox
John Bailey - Cinematographer
Max Bard - Film Director
Walt Becker - Filmmaker
Jack Bender - Executive Producer of Lost
Hugh Beaumont - Actor, television director, and Methodist minister
Les Blank - Documentary filmmaker
Jeffrey Blitz - Filmmaker
Laura Bialis - Filmmaker
Paul Harris Boardman - Producer and screenwriter
Robert F. Boyle - Art director and production designer
Charles Braverman - Filmmaker
Henry Bumstead - Art director and production designer
Bryan Burk - Executive Producer of Lost
Keith Calder - Producer
Trey Callaway - Screenwriter and producer
Andrés Cantor - Sportscaster
John Carpenter - Film director
Sandro Corsaro - Animator and Author
Sean Covel - Producer
Buster Crabbe (B.A. 1931) - actor
R. J. Cutler (B.A. 1993) - Filmmaker
Thomas Del Ruth - Cinematographer
Scott Derrickson - Filmmaker
Caleb Deschanel - Cinematographer
Dean Devlin - Screenwriter and producer
Susan Downey - Producer
Ellis R. Dungan - Director
Robert Elswit - Cinematographer
Rick Famuyiwa - Director
Erik Fleming - Film director and producer
Verna Fields - Film editor and sound editor
Dana Fox - Screenwriter
William A. Fraker - Cinematographer
Joe Francis - Adult film producer
Bruce Geisler - Documentary filmmaker
David S. Goyer - Filmmaker
James Gray - Film director and screenwriter
Brian Grazer - Film and television producer
Taylor Hackford - Film director and producer
Conrad Hall - Cinematographer
Curtis Harrington - Experimental filmmaker
Ron Howard - Film director and actor
George Huang - Filmmaker
Martin Hynes - Filmmaker
James Ivory - Film director
Joe Johnston - Film director
Scott Alexander and Larry Karaszewski - Writers
Howard G. Kazanjian - Film producer
Richard Kelly - Filmmaker
Irvin Kershner - Film director
Karey Kirkpatrick - Screenwriter
Randal Kleiser - Filmmaker
Tom Klemesrud - Editor
Matt Korba - Video game designer
John Knoll (B.A. 1984) - Motion picture visual effects specialist, co-creator of Adobe Photoshop
Ben Kurland - Actor, producer
Gary Kurtz - Film producer
Barry Levy - Screenwriter
John Longenecker - Film director, cinematographer
Robert Lovenheim - Film producer and writer
Doug Liman - Film director and producer
George Lucas - Film director and producer
Felipe Marino - Producer
Gregory Markopoulos - Filmmaker
Kerry McCluggage - Film and TV executive and producer
John Milius - Film director and screenwriter
Herman Miller - Writer and Producer
Ron W. Miller - CEO and president of Walt Disney Productions
Miles Millar - Screenwriter and producer
Walter Murch - Film editor
Don Murphy - Producer
Gustin Nash - Screenwriter
Tom Neff - Film director, producer and executive
Joe Neurauter - Producer
Michael Nolin - Producer
Tommy O'Haver - Filmmaker
Tom Oesch - Director
Richard Outten - Screenwriter
Sam Peckinpah - Film director
Brian Wayne Peterson - Screenwriter and television producer
Gene Polito - Cinematographer and professor at the USC School of Cinematic Arts[5]
Jon Poll - Film editor and director
Jason Reitman - director
Robert Rodat - Screenwriter
Gene Roddenberry - Screenwriter and producer
Jay Roach - Film director and producer
Barry Rubinow - Film executive and editor
Gary Rydstrom (B.A. 1981) - Sound designer
Walter Salles - Filmmaker
Josh Schwartz - Producer and creator of The O.C.
John Schwartzman - Cinematographer
Ben Shedd - Documentary filmmaker
Sigurjón Sighvatsson - Producer
Bryan Singer - Film director
John Singleton - Film director
Stephen Sommers - Film director
Dror Soref - Filmmaker
Scott Speer - Music video producer
Adam Stein - Filmmaker, editor
Tim Story - Film director
David E. Tolchinsky - Screenwriter
Ron Underwood - Film director
Lee Unkrich - Film director
Clay Walker - Film producer, director, cinematographer and editor
Jack Warner - Founder of Warner Brothers Studios
Brad Williams - Comedian
David L. Wolper (B.A. 1949) - Film and television producer
Robert Yeoman - Cinematographers
Robert Zemeckis - Academy Award Winning Film director
Laura Ziskin - Producer