Having first laughed almost with tears in my eyes, and then felt guilty for doing so -- after all the guy is enthusiastic, and might be a good teacher if he "only" would master the subject at hand -- I have now, after reading your comments, reached the reflecting stage:
1. Who is actually "worthy" of being a teacher? There are top players (more so in the world of electric bass) that use techniques (fingerings, wrist angles and so forth) that students generally are better off not copying. Also, of course, pedagogical skills don't necessarily coincide with playing skills. This is not to say that one can't learn from such persons, but teaching beginners is "real" teacher territory only IMHO.
2. Moving pictures don't overcome the problem of one-way communication. I just pulled out my copy of Simandl's book and had a look at Frederick Zimmerman posing: How could a beginning student know what aspects are crucial to learn verbatim, and what can be altered according to personal taste and body constitution? Obviously this basic problem remains in the movie format. Again, it takes a very experienced teacher to foresee potential problems and to address them proactively when not teaching in person.
3. Convenient means for peer-review are a prerequisite to reach and maintain high quality in an open knowledge base. I figure this condition is met in the Wikipedia case; actual experts / nerds / geeks check their pet subjects regularly, and the information is extended and corrected quickly. In the YouTube case however, the threshold is much higher, and peer-review is often limited to comments such as "LMAO! U 5ucK b1g TiMe"... (A polite e-mail to Expert Village might be worth a try, though?)
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