Depends on what the meaning of the word "worthwhile" is.
For a publisher, is it financially viable?
For a retail gofer, does more stuff on an ODG matter?
For those interested in golf during a very important time in its history, without a doubt.
George told me a year or so before passing that the rough draft of the manuscript for Vol. 2 was essentially complete. It required Gib's considerable (like in a lot) editing, formatting, and more photographs and artwork. He was excited about it, noting that it went beyond Raynor into Banks (I got the impression that he had surplus material).
Incidentally, I gave Vol. 1 to my host at Shinnecock many years ago. He wrote back that he hadn't heard of the book, didn't really know much about the history of CBM, NGLA next door which he had played several times, or his own golf course. He was extremely grateful and I hope that the book opened up a new avenue of enjoyment of golf for him. I have no idea how many books need to be sold at the going price to break-even, but perhaps Vol. 2 can be marketed to the thousands of members of Raynor and Banks courses.