I'm not australian so I can't say for sure what's happening down there, but the situation seems very much like France.
In Europe, and especially in France, many people share the belief that immigration is causing problems to the healthcare system. Whether they are economists or fringe racists does not matter if they manage to get enough votes.
I don't know how frequent racism is in Australia when compared to France - after reading about the riots in the press, along with this recent article which featured a poll, showing 83% thought racism was prevalent I thought it was "very much alive". http://www.heraldsun.com.au/news/victoria/racism-very-much-a...
Maybe the press and the polls are inventing things, and my comparison with France is not valid- but since we were talking about Australia, it seemed quite apropos.
EDIT: Volpe, please reread the parent comment. The problem is that western countries with diversity and immigration programs are also the ones with universal healthcare, and that there's a trend of resentment against other groups in these countries (quite related !!) that apparently conflict with the basic idea of social spending, and thus universal healthcare.
I've made my prediction - that countries with low (or no) growth will either reduce (or maintain low) their diversity and increase social spending, or increase diversity while decreasing social spending.
I'll be watching the situation in Europe and North America to see if these predictions happen - using universal healthcare as a proxy to see how social spending evolves.
Australia and Canada could give interesting example since they run active immigration programs and enjoy a decent growth - while still harbouring this kind of resentment. I'd be curious to know if growth can be helpful against this trend, or if the trend is stronger than the benefits of growth and will keep developing.