I think the main reason for the statement from the RBA is to try stop lazy people making dumb mistakes.
As previously stated within this thread, people are buying units that they quite simply can't afford by using dep bonds. All of us here, are people who have, or are, taking the time and making the effort to educate ourselves about investing.
Unfortunately, lazy, greedy people do things without thinking it through and then blame everyone else for there mistakes, usually the various layers of governments.
I think the RBA is covering their own tails, (and rightly so) by clearly stating that dep bonds create a commitment which must be honoured sometime in the near future.
Macca