Welsh is now almost a national language in Wales. The Scottish dialects are reviving to some extent. I don't think it's a major thing, but it's there, and it's happening elsewhere.
Noam ChomskyLike other organisms, humans have a certain genetic endowment (apparently varying little in the species, not a surprise considering its recent separation from other hominids). That determines what we call their nature.
Noam ChomskyLanguage would have evolved first as an internal object, a kind of "language of thought" (LOT), with externalisation (hence communication) an ancillary process. I can't review here the strong and growing evidence to support this conclusion, but I have elsewhere. There are ample reasons why having a LOT would confer selectional advantage: the person so endowed could plan, interpret, reflect, etc., in ways denied to others.
Noam Chomsky