They did release alot of versions of SW on VHS, like you I bought most of them. But apart from being remasterd or whatever, they were basically the same film.
The point I'm trying really hard to make is, if Lucas wants us to see his vision, his version, he's not going to release a DVD now, then in 2 years release his version.

I'm not saying that they won't release another box set in 2 years, they probably will, but the films inside will be the same. Apart from the changes to episodes 1 & 2 that is, the Yoda thing an shit!!!