From China Daily (link):
The Beijing authorities’ decision to put the Badaling section of the Great Wall back under State management is a distinct possibility.
Furthermore, all the revenue from entrance tickets at the section will go towards relics protection. This move comes as the municipal government shows an eagerness to protect the pride of Beijing and China.
The Great Wall Society of China warned that the Wall is crumbling, unable to withstand natural deterioration and calamities caused by people. A survey the society carried out in 2002 found that less than 30 per cent of the Wall was visible.
See also China Daily’s “Great Wall’s protection not so great”
Also International Friends of the Great Wall, a protector of the walls.