Dead and dying languages are really sad to behold. It's not just for the sake of it being different, but because languages are a treasure trove of history, culture, and the way in which people process the world. It's nothing short of tragic when different languages are replaced with a standard (English) as a native language and the others are lost. It's just another facet of colonialism in action.
It's interesting to see a lot of previously thought to be dead and critically endangered languages make a comeback in recent years even though all of the native speakers are dead or very few exist. Really is a good example of how individual change and grassroots organization can make an impact in the world.