Bill Francis, Head of Inflight Customer Experience (IFCE), has repeatedly stated that industrial action will cost crew. This is what he said in a message to crew yesterday: "As I have said before, a strike can only make matters worse and the announcement of strike dates means the savings and the changes in IFCE will inevitably need to increase."
It is as plain as daylight: cabin crew who strike will force BA to reduce future offers, and those who keep working will unfortunately probably have to share the cost.