I am not a great fan of all those people who spend their lives trying to save languages that are extinct or going extinct.
The reason I am so uninterested in the concerns of those people who want to restore extinct, or almost extinct languages, is that language has a function and if the function is gone then the language is gone. We may have lost a teeny amount of wisdom from native peoples when a language dies but we have one hell of alot of remaining native peoples and their languages to study.
To me the most important and relevant fact is that when people need a language, even if it is not fully in use, it will be revived at any time.
Obviously I'm thinking about Hebrew which was not used as a language for people to talk with in everyday life for more than 2000 years. When the time came that the people needed it it was revived. It is vital and functioning today.
The language I want to add to this list of revived and vital languages, you may not know. It was in use in the recent selection of a pope. The cardinals who chose the pope came from the entire planet: they all spoke Latin.
Anyone who becomes important in the curia upper echelons of the Catholic Church speaks Latin.
There is a good reason for this. This is an ancient church that has always been represented in many different parts of the globe where languages are different. But the Church needed to communicate among its members and participants. It kept alive a dead language.
The church had good pragmatic reasons for keeping Latin alive. If you ever planned to operate in the higher echelons of the church you needed to learn Latin. The schools in Rome that prepare Catholics for functions within the church speak Latin 100% of the time. It allows the Roman Catholic Church to be a global influence. And to survive a long time.