I agree with Simon, the fact that it is a popular route means the mayor has to cover his ass; especially as they promote it. The mayor has a responsibility for security in his commune and that can often mean taking decisions which seem excessive but he can be sued if he does nothing as Montroc shows.
Near me a couple of paths have been closed because there is a risk of rockfall but they’ve just built a small housing development right under one of the zones and you can see rocks in the fields! You can be fined if one of the police patrols finds you on the path - how come the police are safe though to patrol?
There do seem to be more late skiers these days. Ken and I saw some extraordinary stuff on the Pic de Bronsin last spring. A snowpack that was completely rotten, unskiable, yet people leaving the carpark on a very hot day at 11am. Ok the lower slopes are low risk from avalanche but the ski experience would have marked some of them for life.