But really, perhaps his more recent work is more interchangable because modern movies are more formulaic? He had a great score in the originals because he had so much more emotions in the movie to be inspired by.

So here's hoping for episode VII!

EDIT:

Here's an idea. You know how movies almost always have different songs playing over the credits? I'm not sure what plays for a new hope I mean return of the jedi. (Well empire could work too I guess, but yoda dies in rotj so I think that'd be more apropriate), but if there's just regular score, maybe you could put in this song:

http://www.youtube.com/watch?v=GITb6rzpTWM

(That riff at 2:40 ooh boy) (I'm sure MelodySheep would be totally cool with it)

Maybe you could fill all of the credits with the original closing theme and good fan songs!

Like this one:
http://www.youtube.com/watch?v=5HmGwRf9KRo