Its true that Star wars may be dying as timdgreat said, and lord knows there are a lot of unhappy fans out there. But what I think everyone forgets is the impact Star Wars had originally. It was one of those rare films that 'Pushed the envelope' of film making. It created a new look, feel, style and even re-created the genre. These sorts of films come along all too rarely ( others would include 2001 space oddesy, the original Planet of the Apes, Close Encouters, Jurassic park, the Matrix, Lord of the Rings etc )
Basically they are films that change the way we think of film or change the technology dramatically and force film makers to re-think the way they make films. The original Star Wars did this, and as a kid at the time, there is no doubt that it changed my life.
I think the reason why people are dissapointed is that the new prequals don quite live up to that. I've heard all sorts of comments from fans and many of them are totally rubbishing the new films. Personally, although I agree that they are not quite as good as the originals, I think they have still opened a few new doors in film that people forget about. One thing would be the ability to have completely C.G characters. Whether you love Binks or hate him, it was a blueprint that others have since tried to emulate. On a technology side I think where Lucas comes into his own is with the clout he has with large industries. Like how many directors, in all honesty, would have the stature to completely re-invent film cameras with a company like Sony. Between them they created the first totally digital cameras which again has changed the industry completely. So although the films may not live up to peoples expectations, I think Lucas has once again tried to 'Push the envelope' and I think he deserves some credit.