"The 25 - 40 age group have little chance of ever buying a family house."
That's not true for the tail end of that age group. I fall in there and so do most of my friends and family and most of them own a family home.
However you're totally right as you start heading towards the younger end of that age range.
"Make no mistake about it, the last 3 years of Govt stimulus and rescuing the banking system has been about preventing property prices falling too much. However, that policy militates againt a fair society and is the main cause of the intergenerational tension between 'boomers' and younger people."
What exactly do you propose they do about house prices?
People will not want to sell their homes once they drop significantly below the price that they paid for them unless they're forced to.
Once negative equity sets in people will just sit tight. So if for some reason house prices did drop there would be less homes on the market as the negative equity people stop selling, and that reduction in supply will slow and then stop the price drop.
It's no good sitting there saying "that house should be worth half as much as it is!" because the owner will just reply "well I paid more than that for it and I won't sell it at that price."
The best bet is that prices will just stagnate and that inflation will gradually cause a relative drop in house prices.
So again I ask what exactly do you want to happen?