I read that book as well when it first came out. It was a very good book for its time. It is a classic look back by some of the guns he recommended because that is what existed at the time.
I don't think he would do a rewrite of it because--THE INTERNET. In saying that I mean that info changes rapidly and people are accustomed to getting the most recent info on the internet, and because people spend much more time on the Internet and much less time reading books. I am not sure he would consider it worth his time.
I took LFI 1 & 2 with him in the Summer of 1986. I still have my notebook from those courses. At that time there were not nearly the number of trainers out there and not nearly the number of people who would travel for training. I think for me it was a 4 or 5 hour drive from NY to NH and a week's stay at a hotel each time.