I think there could be something in this seechange.
The D&G'ers I know became D&G'ers right after they first attempted to buy a property, but then realised that little cute 2 bedder in Elwood they've been renting for $400pw/3% requires a $60k/10% deposit which they have just thought about saving towards for the first time at around age 30 (and they are currently unable to accept the thought of buying a place far out in the suburbs).
So yes, to me, most D&G'ers are people who tried to be first home buyers but failed, so they whinge and post on forums instead, and lots of first home buyers entering is usually what starts booms.
That's the example I use!
Everyone moves to Elwood and st Kilda and then when they are 30 - 35 they wake up to reality and realise they are screwed.
The more realistic people I know live between mordi and frankston
There's always exceptions though
A lot of talk about the peninsula being a good option amongst peers. Not much work down there though