The concept of their central storage as well as full-time PYs for their maintainers should be part and parcel to any purchase of new guns and retention of the M777s. Like any hybrid organization there should be sufficient full-timers allocated for peace-time service and enough part-timers trained for war-time deployments.
The PY game is a tough one in the CAF but if push comes to shove sufficient peace-time maintainers need to come out of gunner PYs. (there are probably enough CWO and MWO positions doing ERE in Ottawa that could be converted to twice their number in the way of the Pte to MCpl wrench turners needed on the shop floor.