I call in a community where the majority of callers use ladies/gents terminology, and I am pushing the envelope by using positional calling. We also have a caller who occasionally visits from elsewhere who routinely uses larks/robins and probably would choose not to come at all if they had to use ladies/gents. I think Don's point makes sense in communities where this has been a contentious issue. But here, nearly all dancers seem to be willing to roll with whatever as long as the calling is good quality. Organizers stepping in and making an across-the-board decision that enforces terminology would probably stifle the process of innovation, rather than encouraging it.