My two cents: For my prospective client... they could have had both their traditional keynote and a non-traditional speaker from outside their industry (like me?) to do a "pre-keynote"... thus giving their audience both the old and the new. For the woman who was more comfortable with a regular breakout session, maybe she could have come to the "Learning Lounge" for one hour over the three days to try out the alternative option.
Yes changes are coming, but it is not an zero-sum game.
Have A Great Day
Thom Singer is known as "The Conference Catalyst". He works with meeting planners and conference organizers to set the tone for a meeting. His presentations educate, inspire and motivate attendees to engage deeper in the event and make meaningful connections. http://www.conferencecatalyst.com