Back on subject... I wouldn't see that huge of an impact by a few Sci-Fi movies in the late 90's, early 00's.
My Opinion:
The primary reason that the original Star Wars had the impact it did was because it was sooo different from what was in the theaters at the time. By the time of the prequels, science fiction and fantasy movies had become such a staple of the summer blockbuster season that anything that looked like Star Wars can't really stand out. All it has to go on to bring in the bucks is the hype and fanbase, and honestly, better writing than a number of other big budget sci-fi films of the time period. But, that still didn't save it in the hearts and minds of the fans.
Add to this what was already stated about the older fans always going to be critical of what Lucas does after years of speculation, and you end up with a nice film that does well in the box office, but doesn't really change the game.
If you want the Star Wars prequels to make an impact, you have to not just make them better, but completely surprise everyone with the product. And I don't mean just better special effects, or getting rid of a few bad characters, I mean -- completely overhaul the whole concept, create something completely new, but in a way that the original fans are going to love. In my thinking, that's virtually impossible.
That said, I would be willing to accept some individual career changes amongst the cast and crew if it is perceived to be a better movie.