Actually, I've talked to Ralph about this issue from time to time, and he didn't seem to be against this issue; actually, he had some corrections and extensions for a new edition waiting in his drawer (and, actually, I have a couple of corrections I would like to add, but anyhow...). For some reason, it never came to the phase of "yeah, right, let's do this now". It's probably a timing issue, and a question of financial viability.
That's the most optimistic thing I've seen about this. Ralph's previous postings seemed more of the "One person pirated my First Edition as PDF so screw everyone that wants to pay me" sort of thing. I've also got "amiga guru" as an ongoing search to email me when it shows up in Ebay, but was not the winner the one time it's happened so far.
I believe the major problem points are: Time (we all have our day jobs and probably a couple of other hobbies), and money. Given the experiences of the first (actually, second, but first international) edition and piracy, and the pretty low moral of the Amiga community concerning copyright, it's questionable if it is worth doing from a financial perspective.
One way possible way woudl be to publish it through a "print on demand" publisher, i.e. you could get a PDF or something for really little money, and a paperback for the printing and shipping costs.
I could try and approach him on the issue if there is sufficient interest.
If there really is some chance, then very much yes I am interested. I'm old enough that I prefer paper, and would buy print-on-demand. (Stacks of paper more conveniently for me hold multiple bookmarks and don't run out of batteries, and my Droid4 phone is a terrible ereader, my only complaint is they take up so much more space than a single good ereader) But PDF is also good for searching, and I'd likely buy both PDF and paper.