I can assure you that if less money was spent on equipment (and the Typhoon bill has already been mostly paid, unlike other equipment out there) it would not be reinvested - it would be taken as a saving.
And as nice as it would be to help the guys and girls leaving with a leg up, the tax payer might have something to say about that one.
The bottom line here is that the Service recruit to a long term plan (especially for aircrew due to the cost of their training), when that plan changes as dramatically as it just has on SDSR there is no easy answer.