That doesn't really matter though, since the goal is 100% coverage. I mean, technically, the NBN was 'useful' even when it just covered the couple of test-run blocks (one ended about 500m from me...).
I've been a city boy all my life, but we really need to stop treating regional and rural Australia as second-class citizens when it comes to these kinds of things.
The other thing you point out is interesting - the urbanisation rate of Australia. It's in the top 5 'big' countries, sitting at 90% - above France at 85%, and the US/UK at 80%. It kinda goes against the mythical image we have of ourselves, the rugged outback-seeker. Sod the wide brown land, give us tarmac!