Theses, books, and articles
Frequently examiners comment on the candidate's publications, or the potential for publications. Here is the gist of three independent comments on the same piece of work; these comments provide an interesting calibration for measuring the thesis against the book or against a set of articles.
In terms of publication, this author should move relatively quickly to approach publishers. The topic is one that lots of people are working on and the data require rapid publication to remain relevant - if not as a complete book, then as a series of articles.
One can typically only write one book based on a PhD thesis.
There is no doubt that there are three or four substantial journal papers that can be mined from this thesis.