1) Turnbull writes the script
2) Coppola is the director
3) No Leonardo Di Caprio
4) Pacino must be in it
My far fetched requirement..... GF4 should be the first movie ever entirely made computer-generated. Before you guys scoff at this idea, let me explain my rationale.....
No one will ever accept not having Brando or De Niro playing Vito Corleone. No one will ever accept someone one other than Pacino as Michael. No one will get over no James Caan or Robert Duvall.
In 20 years, hopefully computer generated movies are mastered. AND....
They digitally record Brando's, De Niro's voice and recreate their voices. Use the 1st 3 films for models on how to recreate all the characters, etc. This way we get to see the same actors/actresses with a new story or continuation.
However, this is a moot point because I am totally against computers/digital arts replacing actors. I am even against computer generated backgrounds.
So, seriously No GF4 unless...see my 4 points at the top