" What is a route’s natural state? What is the place of glue in route preparation and should it be used to ‘return’ a route to its ‘natural’ state following the degrading of time and traffic? Can you chip a chip?"
I think this is just as bad as chipping. Once a chips done, its done. As much as I don't feel that chipping is appropriate(Customising climbs in 2014) that route had history. Is it almost worse to 'undo' a chip? or fill it over? I think so (and who's right is it do 'undo/fill a chip???) Maybe the person who initially put it there? I have been at crags when holds have broken, and that is natural - and it is at that persons discretion to reglue it be if its crutial in the way the line works, but come on - seriously? This is petty!!