I don't think Lucas really had a sense of how fans would react to that scene being changed until well after he did it, and released the film. He lives a somewhat "insulated" life guys, and personally I think he's kind of dense headed when it comes to this kind of stuff. I'm sure in his world he's cool for wearing that shirt.
I think it's very cool that they are posting pictures and videos of the making of the film online. I hope they keep it up. It's certainly getting me interested in a film I was previously dreading.