The problem with Brawl's online play is that it won't allow you to play people with whom you have a great ping.
As such, importing will not allow you to play online! I live in Sweden. The only thing I'm able to do is watch Japanese players play. I've tried playing against some American players but that failed. Said American players couldn't play people outside of America either, but they could play against each other. Also, I've seen a bunch of people complain about not being to use With Anyone and no one actually stating that they managed to get it to work.
As such, it's been speculated that you can only play against players on your own continent (or if your continent is too vast, in a country near you). Trying to play With Anyone won't work unless people close to you try to connect with it and trying to play With Friends against someone from another continent will cause you to disconnect.
As such, if Australia doesn't get Online play, importing will only allow you to play against other Australians who import.