They do already with 320 - so....
PAX are long suffering, and in managements eyes expendible (always more where they came from!). The flights you get rebooked on are often better anyway, so why go back.
The real way to solve this management problem is for the passengers to stop coming - Helvetic need your help, Easy goes most places at lower fares, use AF/KL feeder flights to long haul to show LH that you can talk with your wallets.