When we were there in October the last time the CM I talked to about it said that they were concerned about the traffic buildup in the loop, as well as the traffic on the main road behind the site backing up as well. Campers in the loop, while impressed, were complaining about not being able to get out or around due to the backed up traffic. At that time it was just a complaint they were getting regularly, not sure if that was the final reason or not, but I could see where it could cause problems for others.