Blame the pilots/unions who allowed their management make P2F the only option for the wannabes.
BALPA struggle to get even a 1-2% payrise for their members and even then its at the loss of other benefits, usually starting with those of the F/O's. Pilot unions are pretty toothless really and to expect them to be able to put an end to this P2F situation is not realistic at all.
The only way P2F will disappear is if the European Union rules it illegal due to labour laws or if EASA/National CAA decides that it is unsafe. I doubt ether of these things will happen for a very long time unless there is a serious incident or accident, or the media figure out a way to explain and make it interesting to the general public causing some kind of outcry.