In the same way Hacker News went after founders and developers on the inside of the big co’s, I wonder if it would be useful for OP to go after filmmakers and those employed by the big studios?
Furthermore, the communities for film appreciation and film making may behave differently on a film news website. While people who appreciate film can candidly talk about films, people who make films have vested stakes. This can make Filmmakers self-censor their thoughts. (e.g. They don't want to openly criticize a veteran filmmaker, since the veterans might have influence in the younger filmmaker's future production.)