I suppose it depends how far ahead people can see their careers developing.. in uniform and afterwards, out of it. The Regt is currently promoting some young FS -> WO; the reason being that as far as senior ranking promotions go, this is going to be 'it' for a few years now, and they don't want to be left with a skills void in a few years.
It could be, that the 'able thruster' who might give a couple of tours as a wg cdr but then see that there is no future after than might instead opt to remain as a sqn ldr and then bang out whilst he or she is still young. The reason? Because not only will the more senior appts have dried up, but yet another really good benefit of service will have gone if he/she stayed in and would have had to transfer to the new pension scheme.
That would then leave a slot for someone else, far younger and already in '05, to occupy if they intended to time-serve to 55. I suppose the flaw in the plan is that if it were true, they would have already released the news by now. Unless the administrative 'powers that be' are controlling the release over the next couple of years and are terrified of a sprinting mass exodus.