The book has been successful far beyond my expectations. I think it's going to become the way of the future. I was at a professional ethics conference recently and it was discussed for the first time. It will be popular because it's convenient. Clients don't have to drive to their therapist's office, and can do it during the noon hour or on their break.
Therapists can do it from their homes.
Another big piece is that the client can choose to work with anyone they want anywhere in the world. In my case, most call and initiate working with me because they've read my book. However, there will be a lot of ethical issues related to online therapy. The profession will be defining the boundaries of what's ethical. What I do related to self-esteem isn't considered therapy.