"The Prime Minister and Treasurer yesterday urged customers to shop around for the best mortgage in the same way that they would for any other product."
This is just telling consumers that there are alternatives to the big banks - off the top of my head, Bendigo, Suncorp, BOQ, Citibank, HSBC, AMP. Plenty of foreign banks and credit unions as well. Moving between providers will not impact the security of the overall banking system. Personally, I use all four majors plus Rabo - it pays to shop around.
Encouraging competition is a good thing IMO - in a capitalist system it should ensure a lack of super profits. There are hundred of banks who could open in Australia if they believed super profits were available.
