In that case every Australian owned business selling product is a bad business model when the dollar skyrockets or bites the dust (depending on whether you are importing or exporting)...

. This type of stuff is inevitable and totally un-predictable, sadly it's not as easy as just closing up shop or changing your business structure in an instant when you're left in the lurch with inventory to last you six months (purchased at a higher price) and rental agreements and loans etc.
You're correct that it's not all the problem of Tax and Regulations, but AU could sure do a better job of protecting our dollars going overseas and AU jobs disappearing... (something in-line with other countries).
p.s. Maybe these shops should employ captain hindsight to help them out next time? Or maybe you should write good business models for these guys, you could probably make a killing.
p.p.s.
Here's my quick business model for those wondering;
1. Don't go big into retail of goods under $1000AUD in this country.
2. ?????
3. Profit!