There is a difference between holding on to "the entire amount of content" vs "a bit piece of it".
Like Alamo here. The extra minutes of this movie could be put online at 480P. Seriously...how much "space" in perpetuity is that going to take up?
Even if there is a limit on the "how many at one time" of that content of say, 5 streams at once, if you go to watch it and want to include the 480P segments of the movie you simply get a message of "current limit met". Are 5 people going to be watching this movie in the US at the same time?(not counting release week)
It would give us the best of both worlds. The content we want in 1080P. And if certain parts of a movie aren't as good...they can be spliced in on our whim. No harm no foul on the side of the content providers.
IF such a system were in play...how many more movies could we get on BD?
I, for one, have no problems with a movie having to revert back and forth if certain scenes are best they can be. This entire "must be 1080P" for everything is what slows the selections down. That would also allow future improvement to the content. Let's say one day another 60 minutes of GWTW is found...why not include it "via the 'net" whenever people with "certain versions of the movie" activate their BD Live? You get a notice stating "there is new content for this movie, click for details".(I would also have no problem with there being an extra charge. $2-3...maybe even $5)
No "new disc" to try and package to sell.
No "new disc" to quadruple dip.
Speaking of "having the content". What would stop the studios from allowing the "new content" to be loaded to on-board BD player storage? Or loaded to a DVR/flash drive. DRM exists. IF the extra content is out there...separate from the physical disc, there are already ways to add in the content on the fly.