It's called "disruptive technology" for a reason. Comments here remind me of Kodak's reaction to digital photography. CASA won't have much say in what happens. CASA currently caters for a relatively small part of the populace but demand will force CASA's hand. Uber has already disrupted the surface taxi industry and there's no reason it won't succeed here. Again, it was public demand.
This won't be a door to door service but hub to hub where there will be surface transport? A surface taxi in peak times from Melbourne airport to Dandenong can take two to three hours. An air taxi, fifteen to twenty minutes.