It's a blog! Mainly of book reviews.
The spread of Spanish in the Americans was greatly facilitated by the accidental drastic depopulation of the natives by introduction of new diseases. Well, that will no doubt come up again regarding English in North America and it was suggested as a possibility for the success of Anglo-Saxon in Britain.
I'd say the few remaining Stone Age cultures left on Earth are doomed just on these medical grounds unless they remain isolated from the rest of humanity. I've read elsewhere that there are most likely no indigenous peoples left who have no idea of the existance of advanced technology, even if they don't interpret it as such.