This might be feasible in a small linguistics department where one person teaches phonology and morphology, and another teaches syntax and possibly semantics. I have direct knowledge of only two linguistics programmes in England where such a use could be easily envisaged. I wonder, however, whether it would be possible in a large department where the theoretical orientation of each teacher may greatly differ. Furthermore, though the beauty of this book is its wider than usual coverage incorporating four hyphenated disciplines, I wonder how those teaching undergraduate introductory courses might find it. At the very beginning, it might be more beneficial to students to be exposed to a narrower theory.
Teachers can, of course, select which parts of the book to use.
Nevertheless, it might affect the flow of the text which otherwise is lucid. This I find more practicable and appealing. Similarly, this textbook would be eminently suitable as a self-study aid for postgraduate students because of its coverage and an abundance of data and exercises. I had not expected to enjoy reading a book intended to be an introductory textbook. However, enjoy it I did, and at the same time I learnt more about sub-disciplines outside my specialisation than I had ever done during my postgraduate studies.