The last aeronautical study of Wagga I recall indicated that the level of traffic did not justify any change to the airspace classification or level of ATS provided.
Typically aeronautical studies state their assessments include:
...the reviewed safety and incident data, consultation with stakeholders and reviewing of annual aircraft and passenger movement statistics.
And the CASA ARASMM:
The ARASMM translates the obligations of the Act, the Regulations and AAPS into activities that CASA will conduct, in order to satisfy those obligations of:
- . determining whether the current airspace classifications, in accordance with ICAO Annex 11 - Air Traffic Services, are appropriate
- . determining whether the types of services and facilities provided by air navigation service providers in relation to particular volumes of airspace are appropriate
- . identifying risk factors to determine whether there is safe, secure and efficient use of that airspace and equitable access for all users.
Which suggests safety is the CASA prime consideration in determining airspace classification and level of ATS, and the traffic @ WG doesn't currently justify a CA/GRS or ATC service .......