Moribund languages

According to this New Scientist report, Half of all languages face extinction this century. As these languages disappear, the cognitive structures associated with them vanish as well. On the other hand, there have been efforts to save such declining languages as Occitan or Romansch, or even to revive extinct languages such as Cornish. And what of the nonstandard dialects of languages such as English, French and German? These too are very likely on their way out.