Why do Australians now have a defined ethnic look to them?

Because they all have the same daddy, who is also their uncle.

no longer ethnic pommie?

I don't believe that to be true, it would only be based on stereotypes, take a bleached blonde haired blue eyed surfing fanatic from Cornwall who is good at an Aussie accent, and people all over the UK would believe him to be Aussie, let him speak with a German accent and again people would believe he is German.Dont tell anyone where he's from and they will just assume him to be a local British person.Take a British person to Sydney and tell everyone he's Polish, they will believe it, and again if he dresses casually, and have him just wlk around, people will just assume him to be Australain.

Ah yes, that is because of multiculturalism.

This is in fact the longest word that any of us Australians know.

Over the last hundred years, a lot of people who used to be Italians or Greeks or Vietnamese or Chinese or Afghans or Pacific Islanders or Indians became Australians, so the identity of the average Australian is morphing, compared to the traditional white anglo-saxon convict Australian that was the norm for many decades... then of course there was the black Aboriginal Australian that was the norm for 40,000 years or so before colonization, but we don't talk about that as much as we ought to...

So yes, all these ethnic groups came in, and learned to drink beer and hate politicians and like cricket, and they became Australians. Australians in turn learned to stop referring to them as "wogs". Mostly.

There are more Africans coming into Australia now, so we are becoming darker, and developing an interest in rap music...