|You can't point the finger at NPWS. I think they have, where climbers have cared enough, and provided solutions, been quite receptive, when on the surface, banning would be the "easiest" thing to do.
They are constantly tackling issues such as this , but also have to deal with calls for hunting, dogs , 4wds, "Eco tourism" etc to be allowed , and deal with public stupidity when people injure themselves, while having funding constantly cut and being told they have to make up the shortfall.
An overarching NSW rock climbing access association with affiliation with existing groups such as Sydney Rockies, university clubs, Canberra climbers, and local groups with representation such as Blue mountains, Hunter and central coast, Coffs, Illawarra etc would go a long way to presenting a somewhat united voice and help enormously in dealings with land managers. Trying to get your head around the acts and regulations and plans of management that dictate how our services should function, and using them to negotiate for responsible access for rock climbers is very time consuming, but We do have to get on top of it and work with land managers , or they will take the easiest option, eg Forestry and ban climbing as a dangerous, and damaging activity.