We have lots of languages in the US that are going extinct because frankly, no one speaks them and they never adapted. For instance my mother spent years of her childhood in Wichita, there are very few speakers of it.
On one level it is sad but people who are interested need to preserve what they can for their history. There is a lot to learn from ancient language- many facts can be gleaned from them. But otherwise, it’s silly to want to preserve what very few want to use.
I’ve always been interested in accents, which are also rapidly dying - with mass communication, we are all learning to speak “television anchor”. My family grew up speaking “Brooklynese”, its always been reviled and slowly passing.
Ever hear old tapes of FDR and Elinor? They had an accent that wealthy people used to cultivate. It’s pretty much gone now.