> What if the movie came with the full set of trailers (preview, theatrical, etc.) [...] could even throw in an entirely different ending for the movie [...]

Awesome idea! Throw this in a locked device with some kind of DRM to make sure our viewer has a fully immersive uniform experience, and I'm ready to throw my life savings at it.

(Apologies for that, I couldn't resist pointing out to you where that train of thought has taken the market. ;) )