Considering that our current enemies have minimal AD and if we deploy to some of the African cesspools where unguided 23mm are the main threat, smaller CAS aircraft may be very useful. I think the key is their deployment, don't use them for hunter killer mission where they can be drawn into a AD ambush, but only as direct support for the troops and convoys. Using a platform like the Hawk or Harvard 2 make sense from a logistic point of view, although they would have limited armament, fuel and protection. It would certainly be worth building up a Air reserve squadron here in Canada that uses these aircraft, to build knowledge base for both the Air Force and forward observers in CAS, this ability could be transferred to more robust aircraft and would also be a good way to retain some the pilots in the forces,
I suspect flying around shooting and bombing stuff would be a fun way for a Air Canada pilot to spend their weekends...