the only recruitment for several years to come will be FPP
I disagree with this. BA has always valued input from both cadets (FPP), the Military and DEP and I haven't seen any shift toward only FPP.
A singular input of inexperienced pilots over a protracted period produces seniority and experience problems over a lengthy period of time after the training is completed. That's why BA has always used DEP and Military to mix up the experience levels of FO's and Captains to maintain a mixed level of starting points and experience across the peer group.
I think you will find BA will continue with DEP for the foreseeable future.