On this, Jean-Pierre and colleagues have something more intelligent than what I have to say. I'll try.
Every model we've used and worked with about the vitality of language—and the best ones we have are the ones that Jean-Pierre was talking about that have to do with minority language as an official language—involve an element of public use and public recognition in democratic institutions. It's difficult to say whether it counts for 5% or 25% of the vitality, but it is recognized.