I will give you a very personal example.
I always keep young people in mind. Adults and seniors are important as well, but we often look to younger generations when we talk about the vitality of languages in communities. For minority language speakers, whether they speak an indigenous language or an official one, it is dangerous to believe at a young age that this language is a game. Even if our parents and grandparents speak to us in the language, we can sometimes believe that this language is a game, or that it is only used in a family environment. That has an impact.
What is interesting is that we often focus on the use of a language to communicate a message, but language is not only used for communication. At all times, it allows us to establish relationships and convey information on the social status of communities. As soon as children see that the language is used outside of their homes and immediate environments, that it is used in public, this tells them that it isn't a game: It is a real language that is recognized and used. Children then realize that they have every right to use it outside of their immediate environments. Also, it sends a message about the value given to the language by everyone in the public space.
This kind of effect is sometimes felt subconsciously. Young people, and even adults, are not aware of the influence it has on the way they see themselves and on the way they themselves use the language. But we know that this effect exists. For example, I grew up in a very English-speaking region of Prince Edward Island, but the fact that I knew that French was spoken in Parliament and in Quebec encouraged me to continue speaking the language. I saw it as a real language with value and a role to play.
In applied linguistics, we sometimes refer to collective imagination. In order to commit to a language, we need to be able to imagine what can be done with it, and envision a world in which this language has a meaning. Each time we lend languages validity and we see them used in all kinds of contexts, we enrich this collective imagination, which has a motivating effect.