In reply to Donald M: It's an interesting dichotomy isn't it. As a climber, I want clean rock with plenty of sun to dry it out - in other words, trees cut back from the crag. I want easy approaches with no bashing through undergrowth. It's a selfish viewpoint, but there you go.
On the other hand, I also love being out in the quiet places, with a sense of wilderness. I'm annoyed when I have to share a crag with others - this is my time to escape all the detritus of the modern world and I don't want it spoiled by others.
Hopefully we can reach a compromise, where managed landscapes can still offer some sense of wilderness, be a haven for wildlife and let us engage in our pointless climbing obsession. And whilst we're there, we can contribute to the local economy so everyone's happy.