Yes I know the population is much bugger, etc. But it is amazing. We did the distance of 1600 klms in around 6 hours on three trains. All dead on time and we were on the slow trains at 320 kmh. Way more comfortable than a plane and no luggage and security to stuff around with no $7 airport coffee and you end up in the middle of the city not out in woop woop.
This is a long term plan and by the time it gets built Australia will probably have 40 million people and most of Northern NSW will be developed. Not to mention it frees up the other lines for more rail freight.
it would be a good thing, but don`t expect a cheap fare.