There is a limiting factor an Ireland to Australia service.............
As Irish economy improves and those who have emigrated have already done so then market reaches its own plateau of travellers.
On friends from both Ireland and UK who have emigrated to Antipodes in the first couple of years there are flights back home every year. But as people start to settle in their new lives after 2-3 years then this drops back to every 2-3 years. Even family visiting them tends to be about 1 visit in 3 years.