Yes and no. Focusing in on Vader and Luke does make the narrative focus tighter. However, that's only from an out-of-universe perspective. In-universe, the scale at which the struggle takes place is not affected, or at least not affected as much as it was with the changes wrought in the prequels. The films are the focal point, but they needn't be the apex of in-universe history. Are you familiar with the nine-film idea from around 1979, where each trilogy would focus on different characters and themes - the prequels on politics and society, the middle trilogy on personal growth, and the sequel trilogy on philosophy (to paraphrase)? The idea seems to have been to give a series of interrelated views of what the galaxy was like, to tell a variety of stories. The films are the focus, here, because they're a set of points of interest set up by GL; they needn't be the focal point of history any more than Deckard's hunting of the replicants is the focal point of all the history of Blade Runner's world. When there were to be twelve Star Wars films, many of them would focus on Luke and the Rebels, but one would tell the story of Ben Kenobi, one would be about droids, one would be about wookiee society, maybe there'd be one about the founding of the Jedi, etc. The world was being built more than a single narrative thread. All of that is still possible, but the way things are phrased - the Chosen One, defeat evil/the Sith, etc - make it feel like this series of events is not only bigger than anything that has ever happened, but also maybe the most important thing that will ever happen. It's perfectly possible to tell a story in this way (Lord of the Rings), but it just seems a bit blown out of proportion compared to the OT, to me. I think that's the difference - that even if DE Palpatine became uber-powerful, the universe outside of his influence would continue as it always has, and there could be any number of ways for the future to go. But when someone says, without exaggeration, that (for example) Luke and Leia are the only hopes for the entire future of the galaxy (i.e., no one else in eons hence will ever have any potential for making a difference), or that Palpatine would take over for all of time (i.e., the heat death of the universe), that just doesn't seem to fit, to me. (I know I constructed those phrasings, but they do seem relevant. Something I've never quite gotten about this kind of story, where a human or group of humans is used as tools by some force not just more powerful but indeed superpowerful, supernatural... why are humans the required tools? If the supernatural is so powerful, why not intervene with the other people causing problems directly? Or why not [any one of a thousand, or even infinite, possibilities available to a supernatural force]?