According to the website, March is the target for Volume 14 and JMS should be able to make it, I'd think, assuming the writer's strike isn't settled soon.
I think your roommate will enjoy the script books on a purely professional basis even if he's not interested in the show yet. JMS is telling a lot about his thinking processes and about television making and the tricks he used to stay on budget... The "Complete Book of Scriptwriting" will tell your roommate about structure and contracts and professionalism and the script books will tell about telling a good story. I'd love to hear what your roommate says when s/he reads the scripts and watches the show. It's fascinating to me on an amatuer basis.