I'm sure you're 100% correct in everything you say. Obviously, you have decided only your opinion is worthwhile. That's fine. I haven't the interest or energy to argue. Much more serious stuff to attend to after massive storm here over several days.
I wish you every success.
See the below graph to understand what Mr Z is getting at.
In Summary
The 55-65 and 65+ age groups:
has around 3.231 million households
They would have around 2.691 million primary primary residences
I've not been able to find how many IPs this cohort own.
Now as this cohort progressively ages they will (as is currently happening):
Downsize - just look at how many lone households this group has
Sell up to move into assisted care
Fall off their perch
I would argue that the Children of the 65+ group already have a relatively high level of home ownership, so it's unlikely that their children will need the house as a primary residence, hence are quite likely to be sellers, especially if they want to avoid capital gains tax on the property.
To put things into a bit of perspective the under 45 years households collectively have around 1.546 million renting households. Even if we add the 45-54 year renting group in that still only adds up to 1.9 million households.
Now I know we have the new formation of households due to population growth, but it does seem like there is going to be plenty of established dwellings coming onto the market over the next 30 years simply due to the passing of the 55+ generations.
This increased supply is likely to cap prices rises, especially considering the still highly geared nature of the Australian housing market can't really accommodate too much above CPI prices rises in general.