"The hidden Signs"

In an astonishing narrative of the journey to a remote village in Israel close to the city of Haifa, a team of researchers begin to document an isolated language “AL-SAYYID”. Talking Hands by Margalit Fox is a narrative of exploration of a linguistic team.
The reading is basically about what the language they were researching, where it was used and how it was preserved to stay the way it is. The researchers and linguists went to the village and were going to be granted the opportunity to encounter the language with the people of that village.
The language that they were going to research was a very rare type of sign language that was never recorded.
The Al-Sayyid Bedouin Sign Language (ABSL) is a sign language used by about 150 Deaf and many hearing members of the Al-Sayyid Bedouin tribe in the Negev desert of southern Israel As both Deaf and hearing people share a language, Deaf people are not stigmatized in this community, and marriage between Deaf and hearing people is common.
We have learned various things throughout the semester, one of which was from the documentaries that we have watched which was about rare languages that were close to extinction. The reading also made me think about the chapter 13 I just read out of Yule about the brain and language. I think in order to explore the techniques of any type of language you must understand the science behind learning a language.
My question that I would want to ask or explore would be why we wait for something like a language to be almost extinct for it to be recognized.
What I think is that this particular sign language that is being explored is quite amazing and intrigued me to start to learn more about it.