The purposeful exaggeration of Bart Ehrman on Textual Variants

I'm in the process of reading Darrell Bock and Daniel Wallace's excellent book, Dethroning Jesus: Exposing Popular Culture's Quest to Unseat the Biblical Christ, and their first chapter confirms something I've noticed (not uniquely) about the writings and interviews of Biblical scholar, skeptic, and former evangelical, Bart Ehrman who is most famous for his book, Misquoting Jesus.  Dr. Ehrman routinely lists facts about the text of the N.T. that are not disputed by believing Biblical scholars, in fact most of what he says is very educational and helpful, but then he ends his recitation of the facts with a conclusion that is hardly necessary and in fact a rather significant amount of hyperbole.  For example, when listing off the most important textual variants that affect our ability to know the original text, Ehrman begins with Mark 16:9-20 and John 7:53-8:11 (the longer ending of Mark and the woman caught in adultery), as if these two texts are somehow not already well known for having been late additions to the text.  Those two additions, thirteen and twelve verses, are by far the most significant "changes" to the text, but neither passage has anything to do with Christian Orthodoxy, neither proclaims an exclusive doctrine, and concluding that both are not original doesn't hurt the Christian faith one bit.  How are these examples of significant changes that will destroy our faith?  The other passages listed by Ehrman in Misquoting Jesus (p. 208) as being a danger to the accepted Biblical text are: Mark 1:41, Hebrews 2:8-9, John 1:18, I John 5:7-8, and Matthew 24:36.  In Dethroning Jesus, Bock and Wallace look at each reference in turn, only to uncover that whether or not Jesus is "angry" in Mark 1:41 is not going to shake the foundations of the Church, nor will it harm us to have to see the Trinity in the totality of the N.T. instead of relying upon the late addition of I John 5:7-8, something that Erasmus knew was inauthentic over 500 years ago.  In the end, Ehrman is much sound and fury, eloquently stated with passion to be sure, but rest assured, his earth shattering revelations are far from it.