That's your portfolio risk not market risk. Market risk is out of your control.
Rattling off a few thoughts: 1. A miscalculation in Ukraine causes European banks to call in loans made to Australia. So a sharp reduction in credit 2. China enters recession, again a reduction in credit 3. Australia enters recession 4. Miscalculation by Abbott whose policies cause a decline in demand or in credit growth 5. High inflation causes by a surge in commodity prices and hence interest rates - how high can rates go before trouble starts for those who just purchased 6. Property is very illiquid
So property is not without risk and I believe the risks are steadily growing. Therefore, it was probably a good investment a few years ago but now maybe not