So John Milius just gave this interview:
It's a pretty great interview, but since we tend to talk stucture a lot in these parts, this response in particular was interesting (emphasis mine):
In the old days the writer’s greatest fear was always, this time out, it just isn’t going to happen. I just won’t have the stuff. Now the fear is that I’ll have it, but those little jerks from Harvard Business School won’t be able to understand it. Because these MBAs can follow instructions, they read these books and say your script has to have these characters and those turning points. They ask questions like, “Who are you rooting for at the end of the first act?” I was never conscious of my screenplays having any acts. I didn’t know what a character arc was. It’s all bullshit. Tell a story.