This is a topic that comes up periodically.
I was also flying in NSW during the period when there were asian students out of tamworth.
I also instructed in San Francisco, students from Air China, and Korean Air.
The problem in Australia is that people are so isolated from the non english speaking part of the world that you have no patience for something most of the world has to deal with on a regular basis.
Ever tried understanding a native english speaker from scotland on the radio? Or how about flying across 3 countries who all speak different languages in the space of 100nm?
The accidents that have attracted attention in the past have been due to use of nonstandard phraseology, not because the pilot's accent was hard to understand.
Do some research on accident statistics before deciding that the system is flawed and extremely dangerous.