Wrong. Peter Mayhew is most definitely alive, unless he died extremely recently. He was present at Celebration II, the release party for AotC.
While we’re on the subject, Anthony Daniels (C3PO), Frank Oz (Yoda’s voice and former master puppetteer), and David Prowse (Vader’s body) are all still alive too. In fact, in a recent interview Prowse indicated that he wanted to get back into the armor if the script for Episode III called for the Vader we’re used to.
I’d like to see flashback scenes of Obi-Wan as a child, under Yoda’s training, brought up at several key points in the film. They would recall Obi-Wan at key crossroads in his life, and the choices he made, and he would remember them while seeing Anikin making all the wrong choices. Eventually he’d see Anikin as a lost cause, and the two would fight. Obi-Wan loses an arm, but strangely keeps his original hand
Anakin’s turn to the dark side turned out to be caused by Jar Jar Blink’s accidentally making him bald in a chemistry class accident. He was wearing a wig all this time. Anakin dramatically takes the wig off as a final test before becoming a Darth.
Yoda tells Obi-wan, “You stupid, Leia had the force, not Luke.”
Princess A reads out loud a slash story between Anakin and Palpatine and thinks it is true.