please correct me with examples if i am wrong, but afaik Ehrman is the only modern scholar to directly, explicitly address the question of Jesus' ahistoricity.
A former mythicist now pseudo-mythicist (G.A. Wells) changed his position in response to Dunn's argument. Dunn repeats part of this argument again in
Jesus Remembered. Ehrman is one of the few scholars to write a book addressing mythicism that a bookstore is likely to sell rather than either 1) a work of scholarship or 2) a comprehensive, yet readable without much if any background in the subject, book or set of books on the historical Jesus.
And while I respect him for at least having the integrity to alienate most of his readers for the sake of intellectual honesty, the book is still worth about as much as anything else he writes for the general public: not much. More importantly, this question has been raised and addressed in various ways by modern scholars in recent years. In fact, perhaps the only piece that mythicist R. M. Price wrote which was published in a work written for researchers & students and published by an academic press was
The Historical Jesus: Five Views. Not only did all four other authors show the flaws in his argument and therefore address mythicism, but the only reason he was asked to contribute was he was the only one around. While guys like Mack or Crossan believe that the N.T. (and Christianity for the most part) has corrupted Jesus' message, and there exist plenty of radical views among a minority of N.T./early Christian/etc. scholars about Jesus, everybody in the field recognizes that it is impossible to plausibly explain our evidence without a historical Jesus. Price is the only exception I know of, which apparently meant that in order to get the complete range of scholarly opinion, they asked him to contribute.
Apart from that one book, scholars simply assume uncritically that Jesus was a historical person
All of the books below do not assume this but are either designed to show that it is true in their entirety, or devote time to the question:
Jesus Outside the New Testament: An Introduction to the Ancient Evidence (
Studying the Historical Jesus)
The Historical Jesus: Ancient Evidence for the Life of Christ
Jesus of Nazareth: An independent historian's account of his life and teaching
Jesus Legend, The: A Case for the Historical Reliability of the Synoptic Jesus Tradition
There are more as well.
Even Ehrman the 'professional scholar' does this in his book.
His book, as he says himself, is not professional scholarhip, but intended to inform those who rely solely on websites or sensationalist sources for information.
Apparently the normal rules of academic decency don't apply when discussing Jesus' historicity.
Some of the foremost authorities and leading experts on climate change don't believe that humans are causing any dangerous warming (usually, they either believe that the cause is mainly something else, or that the models are wrong, or both). Yet they are in the minority. And they are mocked by the mainstream and called "deniers", a term designed to equate their stance with the ignorance of holocaust deniers.
And as for holocaust deniers (moving out of science) almost nobody cares about what they have to say, in or outside of academia (and rightly so).
Unlike climate science or any field in which there is a significant minority of specialists challenging the majority view, here instead the consensus is challenged by perhaps 2 or 3 people who are specialists in
something related to Jesus studies, and a vast majority of amateurs who have familiar with any scholarship on the subject but instead rely on websites and sensationalist junk. Is it any wonder that those who have spent years and years and written monographs, volumes, and/or papers on this subject have little respect for those who repeat arguments raised 150 years ago and repeatedly addressed since then? Especially when those making the current arguments have no conception of the history of the "quest" itself, and
why most scholars don't bother to address questions which were settled a century ago?