John Williams was featured at the Young Musicians Foundation recently where he performed some of his classic soundtrack scores. Before Williams was about to perform a few Star Wars pieces he had this to say:
“We’re about to play Star Wars [audience interrupts with cheers] and each time we play it, I’m reminded of the first time we played it decades ago. Neither I, nor George, nor anyone else involved thought this would go far or in a few years there would be a sequel and I’d have to revisit the themes…and years later another trilogy. Now we’re hearing of a new set of movies coming in 2015, 2016…so I need to make sure I’m still ready to go in a few years for what I hope would be continued work with George…[more cheers].” - off of the John William's Fan Message Board
It is difficult to image anyone else composing a Star Wars score. His addition to the crew, though not official, is a no brainer. Star Wars needs John Williams, as much as Superman needs him to fly.