There was a time in the 20th century when brandname business leaders and research scientists could pontificate at the podium. In the question and answer period they weren't expected to grapple with assumptions. Instead the stage was there for them to pontificate even more. That was then.
Then came two severe recessions in the 21st century. Businesspeople don't know so much after all, we figured out. Scientific orthodoxies such as recurrent clinical depressions require lifetime maintenance on antidepressants were disproved. In addition, social media got us used to having a conversation. TED Talks flow like conversations. The members of the audience are treated like peers.
Tonight at a lecture on perception a film from the 1980s was shown associated with the well-known "Course on Miracles." What hit the audience as cartoonish was that the presenter in the film kept hammering his points through those old ah-ha moments. His style was that of the guru bringing enlightenment (via ah-ha moments) to the masses stuck in false consciousness.
Anything less than professional and intellectual humility seems downright reckless in public speaking in 2014. That could, of course, shift in 2015.