That is fascinating.

It is indeed true that you need to be able to produce lots of materials in a written language to be able to maintain it in the modern world. An ancient language that had no writing system and was totally orally-based, and had no vocabulary for all of the items and concepts we use today, has a lot of work to do to catch up. 

That can be done when there is a large enough base of potential users to sustain such an endeavour, as there was in Wales, and in Israel, which revived Hebrew. But is there with aboriginal languages?