Regional languages in Europe have declined sharply, yet some remain in everyday use in particular valleys and districts. The pattern of survival is uneven for identifiable reasons.
Terrain slowed the spread of a standard
National languages spread through schooling, administration, military service and mass media, all of which reached remote valleys later and less intensively.
Where travel between a valley and the nearest town was difficult, the local language remained the practical medium for daily life much longer.
That delay mattered because language shift happens across generations, and a valley that resisted for two additional generations entered the modern period with a much stronger base.
Transmission within the family is decisive
A language survives when children acquire it at home, and it declines when parents who speak it choose to raise children in the majority language.
That choice historically reflected the belief that the regional language limited opportunity, a belief often reinforced by school policy.
Once a generation stops transmitting, the language becomes something learned rather than acquired, which is a far weaker position to recover from.
Institutional recognition changes the trajectory
Languages used in local administration, signage, broadcasting and schooling acquire domains beyond the home, which gives speakers reason to maintain them.
Bilingual education in particular restores transmission, since it produces speakers among children whose parents did not pass the language on.
The extent of recognition varies enormously between countries and regions, and it changes over time, which is why outcomes differ so much across similar communities.
Economic structure matters as much as policy
Communities where young people stay tend to retain the language, because a speech community requires speakers of every age living in the same place.
Where employment collapses and young adults leave, the remaining speakers are older, and the language becomes associated with the past.
Tourism cuts both ways, bringing income that keeps people in the valley while introducing a working environment conducted in another language entirely.
What a visitor notices
Bilingual signage indicates official status rather than everyday use, and the two can diverge considerably in either direction.
Markets, bars and local radio are better indicators, since they reveal which language people choose when nobody is required to choose either.
Learning a greeting and a thank you is generally received well, because in most such communities the language carries a history of having been discouraged.