The trigger for this call in regulation of margin loans that cost people their homes can probably be traced back to the loans Storm were using for their clients.
They used Colonial's CALIA facility. It is a home loan package that has a margin loan inside the facility. So the home along with the share market investments is used as security for the overall umbrella of credit.
Why things happened so fast to Storm investors? Colonial had security over their homes and investments in the one package. I believe also that the Storm branded index funds were administered by Colonial also. All owned by CBA.
Hence the speed and ease for the Storm situation to unravel.
It could be this product that the regulators may be going after specifically, but of course everyone else will be affected.