I think about my believing years, and it would have done me some good to hear people like Harris--or any smart person treating religious beliefs like the crazy delusions they are. When you treat these things with respect, then trusting people assume that there's something worthy of respect there-- that faith is something to be respected. I bet I would have found former preachers and priests turned atheists fascinating-- and there's growing numbers of them.
I'm glad we don't have to tiptoe around peoples' magical beliefs any more. I think there is a lot to be said for declaring the emperor naked. Of course believers will rush and swear that the emperor is wearing magical robes and that they saw them and that the silly person calling the emperor naked doesn't know anything deep about magical fabrics-- but the seeds of doubt will be planted in young minds and they will have a choice that many of us didn't have until later in life.
I do think that religion will mostly be associated with the less educated classes and the poorer in the future. One day people will wonder how it is that people could have ever really believed such crazy things.