I think Chaim could probably write a book using the old archived JTF articles. Some information could be added to any of the topics if necessary. With that information already written down, I don't think it would take Chaim a very long time to write a book.
The biggest problem would probably be finding a publisher. How did Rabbi Kahane get his books published?
It seems like people who get books published are able to get invited on all sorts of news media shows.