In that respect the loco's are very clever, they keep their captains well paid and in return very little trouble is caused as they destroy new FO T &Cs. No matter how many times you say it, you won't stop cadets risking their own and their parents money in pursuit of 'the dream'. If captains had taken a stand a few years back and refused to fly with any flexicrew pilot, we might not be in this situation now.
That said, I don't know much about the situation at Easyjet and it may be that people higher up the food-chain are indeed doing more than it seems from the outside.