I would be very careful about being convinced by any one source to make a major life decision. This applies not only to books, but generalizes to single scientific studies, single "heroes" (see recent threads about sidekicks), etc. Science has peer review, and even ideas that are not strictly speaking science are stronger when they have survived questioning from opponents. I would ask myself if other books by other people argue the opposite and seem equally convincing. I would also ask myself if such ideas as are in the book have become widely accepted, and if not, why.