Exactly,
To often to mention the focus on here has been on the aircraft, and not the manpower (manpower measured & costed in establishment posts). The removal of the capability enabled a sizable force reduction (again, measured in established posts). Reversing that would be a pretty big deal and would only come at the cost of significant pain elsewhere in the RAF (or maybe RN).
Removing a capability is an SDSR level decision, and the same sort of mechanism is needed to restore it. Unless a real shooting match kicks off, of course.