It's not as though Australians are going to stop buying <$1000 stuff from overseas retailers just because the price has gone up by 10%. Clearly the GST is a minor factor at that price point.
Nup. Aussies will now:
1. Have less choice online
2. Pay 10% more to fund a tax that doesn't even cover the cost of collection
3. Any benefit to local retailers / e-tailers will be very marginal and have no impact on the wider economy
So it's just a waste of resources for the benefit of a few politicians who think there's a vote in it.
At the request of the government , the PC did issue a review of collection models and issues a report in November 2017. Key findings are summarised below. If you can't be bothered reading that, I will summarise it for you:
"It's still a stupid idea but since the government wants to press ahead anyway, we have come up with the least-bad option".