My bet's on the government deciding to add GST to items bought online under $1000 due to retail industry pressure and the allure of more revenue, and being totally unable to police it. Most consumers gripe about it but suck it up and do the obedient right thing, a couple of people get busted with nasty fines for dodging it, many more just don't pay it and get away with it, but in the end a lot of people still use online shopping anyway 'cos it's by and large still cheaper even with GST. In the meantime, Ausssie retail prices stay uncompetitively expensive - especially Transformers - and customer service remains often bad and underresourced.
France tries the same thing a few years later and there's riots in the streets - again putting paid to the theory that Aussies are tough, rugged, crocodile-wrestling battlers and the French are cheese-eating surrender monkeys.