But sadly - for would-be buyers, at least - I just don't see it happening.

Sure, there are risks.

If it turns out that banks have been lending to people who really can't afford it, then we have a problem when interest rates start to rise.

But banks insist they stress test customers for a 2-percentage-point rise in interest rates and require "interest-only" borrowers to prove they could afford to repay principal too, if required.

More worrying is the mortgage broking channel, where a recent ASIC investigation found most of the high loan-to-value loans are written.

If there is a weakness in the housing market, it'll be in this area of lending standards and so called "macroprudential" policies when interest rates start to rise. The recent clamping down on investor loans is welcome.

But ultimately, the defining thing about bubbles is that they inevitably must pop.

But where is the trigger for a widespread home price collapse?

In a world of low inflation and growth, the Reserve Bank is likely to raise interest rates very gently, cushioning households.

Widespread job losses would be a trigger, but there is no talk of that. With record low wages growth, labour is hardly expensive at the moment.

Bubble proponents point to very high household debt levels relative to incomes. But the structural lowering of interest rates in the late 1990s and again after the global financial crisis has increased the amount of debt households can afford to service from a given income.

Lower rates have also helped many households build significant "buffers" against future rate increases, in offset accounts and other forms of saving.

Bubbles form when asset prices disconnect completely with market fundamentals.

But there are very good reasons to expect housing to be so expensive.

Forget the Cayman Islands, housing - owner occupied and investment housing - offers the best tax shelter around, from negative gearing and the capital gains tax discount on investment housing to the complete exemption of the family home from capital gains tax AND from the pension asset test.

Meanwhile, rapid population growth has been met by sluggish increases in housing supply. Incompetent state governments have created a premium for inner-city housing, where buyers can avoid paying the indirect costs of long commutes.

In the aftermath of World War II, home ownership rates skyrocketed as governments focused on supply.

But since then, governments have instead implemented policies that boost only the demand side of the equation, with tax concessions and cash bonuses for buyers that only increase prices.

Absent any trigger for widespread forced property sales, home owners will always respond to sluggish market conditions by sitting on their properties for longer. Lower volumes provide a cushion against falling prices.

In such a market, the best a first-time buyer can hope for is that future price gains might come back into line with income growth.

Indeed, that's exactly what happened after the early 2000s property boom when Sydney prices stagnated for almost a decade.

It's less exciting, but more likely.