I have just read your very interesting article, Rebecca, which offers much food for thought.
I do letters in my spare time for Survival International, which campaigns for threatened tribal peoples worldwide. I couldn't help draw a parallel between that infamous Blue Books report of 1847 and the reasons which continue to be given by governments round the world for the need for tribal peoples to abandon their traditional cultures and integrate into so-called 'mainstream' society. In the case of these peoples, it is of course not simply their traditional languages at stake but their whole cultures and often their lives.
I'm not sure of the most recent estimate but the article below stated that in 2008 an indigenous language was dying on average once every two weeks. Also that five thousand of the world’s six thousand languages are/were indigenous, the majority of those threatened with extinction being indigenous languages.
Not sure whether these uplifting thoughts are any use to you, but thought they deserved a mention.