Don't take it to heart Herbie about all these foreigners.
Speaking from my own experience my parents came to Australia for a better life as immigrants, and they became Australian citizens, I was born here so technically that makes me an Aussie.
My parents sent me to Greek school along with my English school, I got to grade 6 and then I didn't want anything more to do with the Greek school.
I can speak good Greek to other Greek Australians that's because of my Greek school days but also cause in my parents house Greek was the first language, I guess if I go to Greece my Greek wont be so good as I do mix it with English.
I also sent my children to Greek school thinking its an advantage to know more than one language and guess what one of them was like me couldn't stand it, the other finished both HSC English and Greek schools.
Both my kid's Greek is much worse than mine, cause my Greek wife and I speak English at home as our first language.
My children will do the same that is speak English at home as their first language, the only time they speak Greek is to communicate with the grandparents.
In a couple of generations all that will be left of the Greek heritage will be the name and that's if they keep such a long surname in the future.
So eventually in a few generations we'll all be true blue Aussies...

...even you, you bloody pom..!!
I forgot to mention this is happening across the board in households with a Greek heritage.