I was recently in Athens and went up to the Acropolis, it was fascinating to see how polished the rock is up there, the flat (horizontal) walkways are like walking on an ice rink in places, (people were slipping over on flat surfaces) which got me wondering about the future of some crags.
As climbing becomes more popular are we going to find some crags, particularly easily accessed/easy/classic areas become unusable due to extreme polish?
which raises an interesting question of how long (if at all?) does it take for rock to recover if not climbed on?