The board DOES NOT NEED any experience with ATM/ATC. That is what the managment of AsA is for. Do you think the board of Qantas needs to have aviation experience? Does the board of Telstra know how to wire up a phone? Just as a government Minister does not need portfolio specific knowledge, that is what their department is for.
It is about management. What a board needs is people with big ears and small mouths. The opposite of DS if you like. They do not need to have specific ATC experience, in fact this could mean they bring the wrong sort of baggage with them to the boardroom table.
Let's see who ends up running the Airspace Directorate.