3. Everybody Loves An Underdog Movie
Or, it could be done in the format of all brilliant underdog sports movies - the ones where, even if you hate the sport, cannot help but pull for Rocky/Rudy/Cinderella Man/the girls in Bend it Like Beckham/Jamaican bob-slay team/Sea Biscuit/Kevin Costner in Field of Dreams. 'If you build it, they will come...' Everyone is just trying to survive life; when we see these people, who don't really have a chance, we want them to succeed. I think because part of us believes that - if they can over come their losses/disappointments/failures, I can overcome my own...they are movies that give us hope of a happy outcome for our own lives. And Quidditch has not been done before! It would pull in all the HP fan base plus people who like sports/underdog movies...