They have implemented the 30 minute afk timer in the past, and in fact its still intact in Firmanent. It should be trivially easy to add it to Gangos. That said, that many people may actually BE in the area right now. It's where groups of friends gather before going into the various zones, but someone might be running late. We had a friend get stuck in a bad Wreath of Snakes (two wipes before clear.... ugh) so he was about 10 minutes late for our scheduled daily DR run together. We definitely occupied space in the zone during that!