My immediate reaction, acknowledging a lack of time and thought, is that a chat is real time and would exclude many. I love being able to check in for five minutes and obtain the information I select and that has been shared. I don't have time for chat nor the interest. I do so appreciate the information I can glean from this site, and would be concerned about chat diverting energy and ideas to a live forum where they could not be captured for all. I view it as more of a social event than creating a forum. Just my $.02.
The World is my country, all mankind are my brethren, and to do good is my religion.