Totally understandable. Glad it's on his eventual to-do list though. Lots of the Ted community would be very interested in making changes towards MMM lifestyle IMO if they were exposed to it. And the people who watch Ted talks (young people, teachers, community leaders etc.) are the type of people who will share and spread information to many if they like it, so it could be a great way to accellorate interest.
Although I personally love the profanity on the site, if he does do one, please encourage him to consider keeping it out of the talk. Lots of us mathematics and social studies teachers would love to get his information into the classroom, but as a former teacher, you know the rules we have to play by:)