The CAF has had Reg F shortages mitigated by employment of Res F mid-rank personnel at rates well north of 40% for a decade or more; it is just now that the true decrepit nature of the attraction, selection, recruiting and ab-initio training system for the Reg F is coming to light. The issues are not novel or complex; there have just always been convenient methods for Reg F leadership to ignore the depth of the problem and resort to inaction and/or hope as the only COA until now when the problems can no longer be papered over.
Professionalization of the HR function is needed, as is professionalization of the force development and structural management functions. Today's Reg F structure is impossible to fill, due to decisions / inertia. Rather than a VCDS doing their job (which sometimes requires telling whiny GOFOs up to and including the CDS "No"), successive occupants of that chair have punted that problem to the future, or decided that "We'll just ask for more Reg F PYs to mismanage" is a viable COA, rather than displaying leadership and making hard decisions.