I'm actually psyched for Episode III. It will certainly be much darker than the previous two episodes: of course, most people will agree that Episode V, the darkest of the entire Star Wars hexology, is the finest film in the series. Of course, because it's in a current pre-trilogy that has not succeeded in the older three, I'm not putting a lot of credit into it. But I will see it.
I doubt Lucas would be willing to make Episodes 7-9. If I were to want those done, I'd want the Zahn books - the Thrawn Trilogy - to be filmed (because those were the first books Lucas allowed in the Expanded Universe), and to be directed/produced/written by someone other than Lucas, though he would definitely have a major hand in it. And the old cast seems too old to make those films, and it would be a major media coup to see who would be cast as the new Luke, Han, Leia, etc.
"I like refried beans. That's why I want to try fried beans, because maybe they're just as good, and we're just wasting time." - Mitch Hedberg (1968-2005)
"Football is about if you want to run and fight for each other, if you really want to play that killer ball." - Robin van Persie, Arsenal FC