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In the fall of 1979, I had a college friend who had a good friend in Massachussets who was into special effects makeup. It seems this guy had been corresponding with Rick Baker, then creator of the cantina creatures in Episode 4. One day at lunch my friend told us these ridiculous ideas about the upcoming Star wars movies, and he mentioned that Darth Vader was going to be revealed as Luke's father, Leia would be his sister, etc... we all thought he was full of crap, and told him it sounded like a damn soap opera and dismissed the whole thing.
Until Return of the Jedi, several years later.
Several problems here. 1st, this conversation took place before Empire strikes back was released, so you should have realized in 1980 that his story was true. 2nd, Leia as Luke's sister wasn't a concept that was worked out until well into the script writing process for jedi. Initially, Luke's sister was supposed to be secreted away somewhere outside the known galaxy. That's according to Gary kurtz, producer of Star Wars and Empire. The whole Leia being Luke's sister thing came later in the script writing process, certainly a good deal after this supposed lunch.
As for the rest of your suppositions on where the sequel trilogy is going... Well, it sounds pretty poor to me. That being the case, I can definitely see Lucas going that route. Personally though, I'd be very much surprised if that's the direction 7, 8 and 9 will take, if they ever get made.