[Potando]

These articles appear from time to time but they never give any sensible reason. Just take it as given that languages must be saved. This one has a long diversion into indigenous medicine - not something that needs a language, but rather needs knowledge, using any language. Here's the closest thing I found to a reason though I only read half way:

"But the loss of languages passed down for millennia, along with their unique arts and cosmologies, may have consequences that won’t be understood until it is too late to reverse them."