I think things have definitely changed since the bb was brought in. I got it for DD1 who is now nearly 8. The school she attends has changed dramatically apparently in the last 5 to 6 years from having a large population of families where one parent stayed home to now SAHPs far and away being in the minority. And we're in a suburb not particularly affluent but also not struggling - very much MOR.
I think what's interesting is the Howard gov't was all about the tradition of single income families yet the Abbott gov't (makes me sick to say that) will be about keeping both parents in the workforce.