Who runs the Country?
Ozgrade3, bloody good question. Of course the RAAF do not run the country. Neither is the current Federal Government doing much of a job of it either. Your suggestion that the floodplain to the north of Richmond be built up and the airfield expanded is probably not implausible, but it won't happen in my lifetime nor yours most likely.
As for the RAAF not allowing civilian aircraft to use their facility, don't think that is the case. Many airfields are shared and have been for years. The RAAF may control airspace around airfields, but they give clearances to non military aircraft to use that airspace and the associated airfields. Maybe you did not vote for Wing Commander So and So, but just remember that maybe someday you might appreciate him or her as they fight to keep you free to fly around in this country.