How to preserve all kinds of languages?

About the revival of languages. On my options, it can occur in two ways.
First, linguists can study moribund languages and seek to preserve the components of the language:the sounds, the vocabulary, the grammer, and the traditions.
The second way is to teach children the language and have linguists advise on language maintenance.
I also want to know your thought. Let's talk over!!

Different countries have different attitudes towards the preservation of their languages. My personal preference is for a descriptive rather than prescriptive system.

In France, however, I understand that they have a prescriptive attitude, with tight controls over how the language is used and an official block on 'foreign' words being brought in to the language. I've even heard that there is a list of official baby names they have to stick to. This seems quite ridiculous and over-controlling.

I'm not sure if the original question was about reviving/preserving dying languages though. this is a diffeent idea altogether. In Britain, although English is spoken throughout, you mustn't forget that there are other countries here apart from England. Wales has its own language (Welsh) and Scotland has a couple of very distinct dialects and I believe its own language. Even Cornwall, which is a county of England but historically a separate kingdom, has its own language. These languages were officially discouraged until quite recently, to the great resentment of speakers, but now at last they are recognised and numbers of speakers are increasing again.

Language is so often tied into people's sense of identity.