I think we need to be careful not to conflate the need for general diversity with wanting diversity in niche media products. In the mainstream media that purport to present a picture of whichever society they are in (be that the US, Australia or the UK), they have an obligation to reflect that society in all its diversity, not just present a sanitised (and often whitened) version of it. A niche media producer that wants to cater for a specific audience should not be expected to show imagery that is not what that audience wants. That should apply whether the audience wants black, white, male or any other specific type of models. (Should Ebony be required to show Indian models? [i don't know whether it still exists, just an example.]) To be clear, I'm talking about an audience that wants, for example, porn involving Caucasian men, not a Caucasian audience, they are different groups.
So, Bel Ami can have whoever it wants in its scenes, but Neighbours should reflect the diversity of Australian society. Not that I watch it.
(An aside, I'm watching the Open, and there was just an ad from one of our major banks featuring a wheelchair tennis player.)