I come from a Sourashtra speaking community. We’re a small bunch of people immigrated from Gujarat to Southern parts in different waves during the Middle Ages, mostly because of war and trade.
Our language has been preserved though the common speak and has no agreed upon script, so it is majorly taught to the children by their parents and relatives. Most of us know Tamil/Kannada/Telugu because of the main language in the place we live in and also use it to publish local magazines.
The magazines though are published in Hindi, Tamil, Sourashtra scripts, the interest is declining at a fast rate. Fewer people want to buy and even fewer want to write. In my city, some are distributed for free only to see it being used for packing pakodas and samosas. Another factor is, many in our community marry people from outside the communities (I'm not against that) and their children can barely understand the language. Our language is still not in the endangered category, but I see it becoming one in the coming decades. More people in our community are getting educated, becoming modern (by western standards), want their children to communicate in English and as a result most people have become middle-class to rich. The reasons for our endangerment is partly because of modernisation.
I'm seeing the coming generations have lesser and lesser interest in growing the language as my Grandpa rightly feared, and will be one of the ones forgotten by the end of this century.
https://en.m.wikipedia.org/wiki/Saurashtra_language