I think you misunderstand what I am referring to. I am not talking about a wish to learn a language, but to consider languages as useful or useless in regards to their entire existence.

This is unfortunately not very uncommon in people of European countries who look down upon regional languages, stating that their existence or that learning them is useless (not for them only, but for anyone) just because you can already do the task of communicating with others through the national language (per example, considering the existance of the Occitan language useless because the people of everywhere where it is spoken can already understand French). This is done by people who not understand (or even worse, who don't care about) the value that exists in language from a cultural perspective.