Part of problem lies in air carriers and their HR politics. Saving money for people T&C, training and education is very effective but you can't attract those who knows how to make bussines more effective.
I have never heard that someone who knows how system ( ATM, NM etc) works, has left ANSP ( especially those paid by CRCO) and join air carrier.
It is just too big difference in T&C and less social security.