I don't have the time nor the inclination to get into with you, but Demarest and Coe are not nearly as "authoritative" in 2009 as you'd like to think.
In any case, the fact remains that Dr. Hansen is one of the most highly respected archaeologists in the world today. He is considered perhaps the foremost current expert on the ancient Maya, hence his being asked to consult on the film. You and your buddies here can and will--as expected--dismiss his belief in the Book of Mormon as unrelated to his profession. I only know that he knows what he knows, and yet he still believes. And, to me, that says something about the possibilities that you fail to appreciate. It says that someone with a grasp on the "big picture" of ancient Mesoamerica can still find room in that picture for Nephites.
I note you ignore the fact that Dr. Clark clearly stated he's attempted to convince his colleagues that the Book of Mormon is Mesoamerican in origin.
As opposed to other scientists and scholars, whose minds are tabulae rasae, who simply stand before the world of objective facts without any preconceived notions and permit The Truth to speak through them unfiltered?
Both Dr. Clark and Dr. Hansen believe due to spiritual testimonies of the Book of Mormon. They don't consider that it "might" be true - they already "know" it's true due to spiritual affirmation. Then they work to find evidence that supports that "KNOWLEDGE".
Having sure knowledge, due to a method outside logic or science, that the Book of Mormon is an ancient document is far different from scholars dealing with normal biases towards or against various theories.
Extremely intelligent, informed people can and do believe in theories that the rest of their colleagues find "eccentric", to use a kind term. EA just provided an example, and there are many others.
What would be persuasive in this is if Dr. Clark or Hansen had been able to convince their colleagues that there is good evidence to consider the Book of Mormon an ancient Mesoamerican document. Dr. Clark told us himself that he can't do that.