Back in '73-74, Lucas was writing the script for Star Wars. He’d made some money from American Grafitti, his own Rebel without a Cause and now he was about to pay hommage to the Flash Gordon series he watched as a kid at the matinee, including the slanted scroll of text. Lucas never really had an original thought in his head, but derivative as it may have been, Lucas was a good hack, and he used all the tricks in the book when he made Star Wars.
Maybe he had hopes for a sequel, but Star Wars in it self, is pretty well contained and had it not been the blockbuster it was, it’d been good enough as a stand alone pop corn flick (much like **Close Encounters ** was).
Being a bright, but un-original film student from UCLA, he knew he had to “cut to the chase” and siphon out what back story was needed for the cut scenes, to use computer game language. The Empire (Ming) is evil, the rebels do have a cause and triumph in the end, when the Death Star is blown up. Lucas may have used the monomyth (Hero of a 1.000 faces) or he might have just stacked clichées on top of each other, which more or less amount to the same thing.
Anyway, what I’m pondering is what kind of backstory Lucas had before he started retconning things. There’s no indication in SW that Vader is the father of Luke, nothing to say that Luke and Leia are sisters and the award ceremony at the end doesn’t indicate that this was a small battle won, but the war was still raging.
Lucas might’ve pissed off fans a number of times, but on the whole, his retconning has been taken hostage by what he commited to celluloid and what too many fans remember, so even if he’s tried to change a lot of things, as an excuse to return to the franchise, he’s still bound by the basic pretexts he presented 30 years ago.
I guess I’m rambling. And I think he’d done better doing three movies taking place after RotJ, or in parallel with the three first movies.