I've thought for a long time, that an interesting documentary series could be to interview and show photographers working in various genres. One episode would be on sports, another fashion, commerical, etc. They could haul in some of the 'names' like Annie Lebowitz, Walter Iooss, David LaChapelle.......
Be interesting to see the process they go through to create the final image. I really regret not going and assisting for some big shots when I was young, just to see how they approach things.