Piper's book has been out for a while and I am afraid of a couple of things happening:
1) Piper fans are going to read the book to find ammunition to use against N.T. Wright, a scholar that they will never meet, and those same fans will probably never meet somebody who has read his books. Why anybody would do something like this I will never know. This will cause them to bore friends with no care for these particular background matters by discussing such things with them in detail.
2) N.T. Wright fans who have never finished a book by Piper or Wright will read the first few lines and complain that Piper has misunderstood Wright.
3) People who don't think Piper is a real scholar will scoff.
4) People who don't think that Wright is really a protestant will cheer.
5) Undergrad theology and bible students who read blogs instead of books will have all sorts of commentary on the issues in their dorm rooms instead of wrestling with the texts, the author's arguments, and in prayer.