Jim, think of it as a podcast or additional feature of the board, but with all member gca's and their compadres participating at one time.
Everyone will know when the roundtable will take place, ie. on the first Friday of every month, and can tune in.
Discussion in the DG before, during, after will occur no matter what. Certainly something like this will generate discussion, not take away from the discussion of additional architectural topics.
John, I'd limit the actual roundtable to those people who are presently involved in day-to-day golf course design and construction. What topics follow from the roundtable discussion are anyone's venue.