He may be right though... perhaps the reason George can no longer deliver is because he no longer has any real love in his life, just lots of money and lots of yes-men. When he did the first three Star Wars films (and wrote the story for Raiders of the Lost Ark) he was married, but his marriage fell apart somewhere doing ROTJ. So now that he no longer has any love in his life, he is unable to aspire to the greatness he once displayed.