The reason that BDE (now known as ALTNet) didn't get interactive movies off the ground is because they didn't adapt their flics for how they saw the audience treating them. People didn't interact. They sat there, watched it as a film and then if it grabbed them they watched it again, maybe pressed a button or two. The rate of interaction was too fixed. The cartoon visuals were technically impressive but not as good as cheap Saturday morning stuff. The Multipath Movies didn't work.
Re-mixable films could work, if we get the soak test right. The film is the soak test. There's a hell of a lot of exposure to an idea in ten minutes, even five. If the audience leave with a feeling that they've only just scratched the surface of what the thing can do, and they liked it linearly, then the hackers will jump in.
I think people will see things they want to do with the film and I think the tone of the community will be raucous. There'll be no real way to unite people behind one cause or one style (other than the technical design) so it may as well be organised chaos. It should be easy to set up your own branch of the site for your people, your films. OK it's another one of those bloody personalised web sites. "Hi Bob" but I think they're pretty cool. The trick has to be subtlety. The system will try to know you but doesn't advertise the fact. The end-user license agreement that comes with the film will describe exactly what is being attempted. User opt in to play.
It would be cool if the aesthetic of the community site was the same as Blake's tech in the movie. Quick and dirty but scalable. I like websites I can set to zero images, minimal images and glossy. Three levels of visual setting.