Generally AT hikers stay near water sources with flat areas for camping, which most of the shelters have. Would they be more likely to disperse without the shelter sytem? Yeah, but they'd not only be camping at sterilized areas sans shelter, they'd be more likely to impact casual water sources along the trail. The question is do you want 250 areas with high impact camping or 500 areas with fire rings at each personal camp area?
Hahaha.... I'm not ripping him at all.
Removing the shelters isn't going to clean up the areas. People are going to need someplace to say. Why not concentrate the impact to certain areas?