So, what did NZ do? Well, they waited about 20 years and then in 1977 followed Victoria's lead! By 2004 it was obvious that it was a stupid idea (petitions from the AA etc) but the Labour Govt. at that time would not entertain the idea of changing it back. So, finally, here we are, springing into action some 19 years after Victoria changed back!
It's hard not to be cynical when the country is run by morons. Here's another delicious detail: the original date for the changeover was set to be April 1st (I kid you not). When tackled on the wisdom of this the bureaucrats "didn't see that would cause any problem", but eventually conceded and changed the date. Maybe they were going to wait until after midday to introduce the new rules!