Gold Coast airport management isn't keen on public transport - for example the taxis have been thrown out and have to line up outside a nearby hotel because Uber bribed Gold Coast airport to remove the taxi rank from in front of the terminal.
What OOL really needs is a railway station - for what you and I call trains but opponents call "heavy" rail. That would not only ease transport from the airport, but a fast train to Brisbane would attract commuters to the southern Gold Coast and ease the housing crisis in the city.