I've been trying to size up how much I agree with that view and what the implications would be for writing a new PT. Darth Vader and Anakin Skywalker are now separate characters. Vader is Obi-Wan's apprentice and Anakin is Obi-Wan's closest friend and a fellow Jedi Knight. Vader goes over to the dark side and joins the Dark Lords Of The Sith. He then betrays and murders Anakin. Obi-Wan fights him and causes him to fall into a lake of lava. Vader survives and is encased permanently in a life-support suit & mask.
Being an OOT fan from way back, my main concern is can I afford to drop the "I am your father" moment? It is one of those jaw-dropping moments that made ESB such a cool movie. This leads to an interesting question: can I integrate this into the above situation. Well, I can but... it would make things a lot nastier. Vader could be Luke's father if he was to, well, rape Anakin's wife, to put it bluntly. This puts a new complexion on things, particularly Vader's character and also the way Luke would respond to this knowledge.
Would I also keep that Leia is Luke's sister? I don't know. I could live without it a lot easier than the reveal of Vader as Luke's father. It now seems a bit too contrived. A way to tie up the love triangle developed over ANH and ESB and the threat that prompts Luke to attack and defeat Vader at the end. Nothing more.
Any thoughts?