Sorry, but I just don’t trust the movie industry to do something like this. It sounds good, and it would be welcome, but think about it… the movie industry made a killing on the VHS-to-DVD format change, just as the music industry did on the cassette-to-CD change, and the 8-track-and-LP-to-cassette change before it.
Maybe the movie people have realized that the DVD-to-Blu-Ray change isn’t going to be nearly as lucrative (because there’s no real benefit to convince the consumer to re-buy everything in the new format), but I doubt they’ll give up all that potential revenue without a much larger fight. They’ll find some way to cripple this before long, maybe before it even launches. And you can bet that you’ll pay more for the privilege of having it, too.