Maybe it's a reflection of the amount of cultural diversty within the acting community. If you watch sbs or abc there are plenty of shows promoting the multiculturalism of australian society. Actors from all backgrounds are give the chance to pedal the wares.
Maybe commercial television is a relfection of the boardrooms that run them.
Maybe the share holders don't want to gamble on racy or controversial programs the would go against the culture of white/anglo australians.

[edit] I still think the The A team is a fair representation of our society
