And although attrition is low, many FO's have just left/are about to leave for Monarch and last time BA were recruiting, they took scores if not hundreds of FOs not to mention a handful of captains. There is a small but steady trickle of FO's and some captains/training captains leaving for Emirates.
Command at Easyjet is far from being a dead man's shoes situation. I would say 5-10 years after becoming permanent, but closer to 5.