He's quitting, at least for the most part.
I have the feeling that there is something problematic about devoting your life to attacking what you are against, as opposed to defending and developing what you are for. I've noticed in showing atheist-theist debates to audiences of students that the atheists in those debates come across as negative and angry. Part of it could be the nature of the position they are taking; they have the job of tearing something down, while the believer is trying to build something up.
But, to paraphrase Richard Nixon, we won't have John Loftus to kick around anymore.