msycamore said:

The old home video versions are Lucas' "restored original cuts", but the original theatrical releases should be preserved anyway IMO. One of the nice things about preservations of different cuts, is that you can study the films history.

Yes, it's one of the things about Blade Runner that's interesting; being able to see the different versions and compare them. Ridley isn't just re-releasing the movie every few years with some minor or major changes and then erasing the preceding version of the film. He realises the place each version has in history.