A language carries its philosophy inside the words. Not all philosophical concept can be easily translated in other language. Take a Hindi/Sanskrit word "Aatma/Ātman" for example, it is translated into english as "soul". But it is wrong translation as plant, animal don't have "soul", while even bacteria have "Aatma/Ātman". If Sankrit is lost then the concept of "Ātman" will also be lost.