The idealistic peak oil film would be more like a clever mix of entertainment and documentary, using real people or actors engaging in realistic and fictional scenarios in a future historical backdrop.
The entertainment/documentary template you should follow is to watch "Liberty! The American Revolution" videos. The scenes are reenactments of the American Revolution years but the actors who portrayed American, British, and other figures, great and less, spoke to the camera as if it feel like it's a documentary, recounting their involvements and experiences. It was a well-made, critically acclaimed video from PBS.
You could try to imagine and produce a near future American society in danger of imminent chaos and anarchy following a major war in the Middle East. You have to develop some type of political, economic and foreign scenarios drawing from the various scenario sources from Peak Oil authors such as Matt Savinar, Paul Roberts, James Howard Kunstler, Richard Heinberg and others.
Then develop American and other characters from around the world, but in America, presenting their "views", "involvements", "experiences" and "actions" of the whole fictional pre-collapse situation and the consequential aftermath of the collapse. You could make the whole thing look so dramatically real like the 1983 TV movie, "The Day After", even it is fictional.
Good luck with your endeavor for a peak oil movie for TV, maybe a season long mini-series.
Otherwise, I have a feeling that we are all going to see the real thing soon.
