If you are talking about the official over night rate as set by the RBA; then yes, they can possibly come down.
But if you are talking about the interest that the banks charge on loans: Then no. These rates ain't coming down.
If there are problems in the world economy brewing: Who is gonna wanna lend money to a banking system with the same one horse economy as developing nations, but with a property market more pricey than other developed nations?