We have "pockets of pristine nature that are not for photographers or anyone else but only for themselves." They're called wilderness areas. The parks aren't supposed to duplicate wilderness areas, by design and intent they're reasonably accessable to anyone . The Park Service may be doing a good or bad job, I don't know I'm not an expert on this subject by any stretch. But with budget issues and manpower issues and environmental issues and competing interest groups and politicians and bureaucrats all thrown together into the mix this strikes me as a complex subject and not one susceptible of simple solutions like closing all the parks for three years.