Does anyone know why the convoys are now appearing to be split up into Fuselage sections only and wings and tail planes only? Is it just to keep the Infrastructure functioning and operational or to reduce costs? Or to reduce storage space, so that the A350 production ramp up can occupy some of that space to allow for outfitting of A350s, since production and assembly is certainly much faster than delivery at the present time.
I don't think anyone on this forum knows Airbus' exact reasons.
What we do know is that this situation has happened in the past, when some event was disturbing the usual organisation (for instance, when the British wing factory had to be temporarily stopped to implement some changes in wing production).
In this case, we know that Airbus is implementing a rate reduction, but we don't know all the implications. We also know that not all parts have the same lead time, so it must be a headache to organise all the changes.
I'm puzzled about how Emirates is handling the ramp down. They have presently 13 frames in the production cycle and I believe they are only planning on taking 12 a year. Yet more frames are being delivered, so it looks to me that Airbus is going to store completed but maybe not outfitted Emirates frames at both Toulouse and Hamburg. But in the meantime provide Singapore with their frames on an about quarterly time scale.
I believe that you are right in that ramping down is going to be extremely difficult as the lead times on some items is quite considerable. I remember from my time on the Lockheed C5 Program that the main undercarriage fuselage frame forgings had a 24 to 30 month lead time.
The storage would definitely give Airbus a lot of flexibility in ramping up again quite quickly should the need be.