As I have said previously if things start going sour the RBA is going to bail out people on mortgages - big time! They will drop rates to near nothing as they have in the UK and US if they need to.
Even if those with mortgages cannot sell their home for as much, their mortgage repayments are going to be cut in half.
Everyone else that does not have a mortgage will be cross-subsidising them by having to pay higher prices from inflation caused by low RBA interest rates.
The old saying you have to be in it to win it remains true!