It seems to me that only a small fraction of the RATS will read his book, and since he has stated that parts of his book are fiction it’s a minefield for even for the media to quote it as fact.
IMHO it will not hurt Trump at all.
Even though the guy (Wolff) admitted in an interview, yesterday, that he only spoke directly with the President a total of "approximately 3 hours", and DJT has only been in office for a year, I don't see how he could know all the things that it is supposed to appear that he knows in such a short amount of time with so little resources. I think I was listening to an interview with him by Megyn Kelly(?). He told her this and even members of the Trump family were saying he was "unfit to serve". I just can't believe that.
However, IMO, considering all the attention that the book is getting at the onset, I think the libs are going to hold it up as their "bible" and consider it complete and utter fact - "written and compiled by an insider". I saw a similar quote to this on the huffpo yesterday.
I think they'll be talking about this for the next 7 years that he is in office...or at least until the next book comes out.