I saw an interview with Lucas and he claimed that because of the poorly kept condition of the original three films that he could not get the to transfer to DVD and maintain THX standards. I don't know how true this is, but he said back when origianl movies were made no one thought to preserve the film for later reproduction and much of the film is too aged to transfer properly. I hope this is not the case and would like to see them released even if the picture is a shade crappy just because I hate to blow the dust out of the old VHS everytime i want to watch na older movie. DVD are far more convenient. I can see however the general public blasting him for just trying to make a profit if he released a DVD with less than spectacular quality.
One thing I have learned in this industry. It is easier to pull a wire than it is to push one.