There are about 6000 to 7000 living languages in the world today depending on how you count and maybe 900 of them are in Papua New Guinea spoken only by a small number of people each.

For comparison Europe has about 200 different Languages at most including immigrants from outside the continent.

Europe used to be a lot more diverse but empires building and ease of travel and communication led to a certain degree of standardization.

Around the time of the French revolution less than half of the population of the country spoke french and only a small minority spoke it well.

Loss of linguistic diversity is in many ways a natural result of living in a world where you can easily travel beyond you local village.

On the other hand colonialism and conquest that tries to destroy the native culture and langue of a place is also something that has been going on since the dawn of recorded history and likely beyond.

So both normal progress and "normal" evil crimes against humanity have worked hard at reducing the number of languages that are left on this planet.

It makes communication easier but also means we lose a lot of cultural diversity and ways to look at the world and many people lose their own cultural identity.