I am all for encouraging FNs to retain their languages, but am not optimistic. 

For a language to survive and thrive, it has to be useful in everyday life.  And for that, it has to be used by many people outside the immediate family in  one's normal activities, from practical ones like commerce, to work, to cultural activities. 

In this case, there are too many of them, spoken by too few people, so that they are not useful outside of a small community. Any writers, singers, radio or TV shows or movies, etc. in that language can only reach a tiny audience.

Speakers of native languages still need to speak English or French to communicate with the outside world.

Hebrew was successfully revived from the dead by making it the official language of a relatively populous country, where it became essential for everyday activities and cultural activities. Meanwhile Yiddish died.

BTW, I am fluent in French and English, and studied Spanish and German.