You should look at how here in Wales we adopted a language policy. Welsh was dying in the 60's and 70's, spoken only really in the extreme rural North West or when the anthem was sung. It took until the 90's for a policy to truly form, where it would be compulsory to GCSE level in school, and laws put in place to protect the languages use in pretty much and and all contexts. Welsh language use has grown from around 40% of the population competent to well over 70% in 30 years, and now not being able to speak the language actually counts against people in terms of employment options in many public sector positions nationwide, and in pretty much any job outside of the South Wales industrial/M4 belt. All official government and public sector materials have to be bilingual (which is rather inefficient) and schools are expected to have a bilingualism policy even if not teaching in the Welsh language. The road signs are legendary. S4C is a welsh language only TV channel that has some popularity, and deals with issues within Wales that the other boradcasters ignore. Now the language is looked upon as a key part of our national heritage and idnetity (along with rugby - lol), even if it does cause friction between the mainly Welsh speaking north and mainly English speaking south. A key difference may be that the languge is historically relevant to the whole nation as opposed to a particular region or social class - if anything historically the language identified the welsh as different from the invading Romans, Normans or English.