They will appeal.
They will, but they've already been through this in the EU. They will take several years to drag this out through courts and "negotiations" until they comply so maliciously you'll need a new term for that.
Where is my pop-corn?
"Apple has lost major, high-profile appeals before the European Union courts in two primary landmark matters, while also winning an earlier round in one of them."
The Federal Court is already Australia's second-highest court. The only higher level is the High Court, and like the US Supreme Court, they're quite picky about what appeals they'll accept.