Enclosed driver's cabs are becoming widespread around the world but, as for trams and trains, they have to come with prepaid or tap-on fares and removal of involvement of the driver with any revenue function. All door boarding is also progressively reducing the interaction of drivers with passengers, though the drivers' unions are opposed to all door boarding in NSW, but not in other states and territories.
It's taking a long time for the penny to drop among some people that the shortage of professional heavy vehicle drivers in general is an Australia-wide and world-wide issue. This article summarising some of the issues is about truck drivers but the problem includes bus drivers:
One can find many other news items on the subject, including highlighting the most fundamental issue that more older drivers are retiring from the industry than there are young drivers entering it, such as:
And none of our remaining government bus operations are immune, so it's not "privatisation":
It's a huge problem for heavy road vehicles because full automation, which eliminates the issue in a growing number of commuter railways and will come to trams during this decade, is a way off. Railways are fortunate:
Tony P