You know, I never noticed how great that piece of music is until now.

I also think that, with a little trimming, that sort of prologue could work very well in a more radical prequel/reborn-style edit. In particular, I think only one past defeat of the Sith needs to be mentioned; the parallels with the Lord of the Rings films are pretty close here. Sauron, and Morgoth before him, were defeated-but-not-destroyed several times before the story opens, but the film only shows the most recent instance.