The key to whether or not a cultural group is able to perpetuate their culture has been the question whether or not these groups are allowed to maintain societal institutions in their language. Regarding decentralization this might be associated with the question of whether or not these groups are provided the space in the legal and policy framework and whether or not their political and social institutions can (and should) be integrated into it. This I think is a largely a question of whether or not these institutions can be maintained in the mother language.