Every year some languages destroyed. This is not significant duo to we can live easier if we have fewer language in the world. I believe, this can help people to live easier.
This is obvious, if we have fewer language in this world, we do not need to learn a lot of language. Just imagine we have solely one language in world. All of the people can speak with them easily. All students can go to that university they want without thinking about where the university is and which language they have to learn for applying to that university. Everyone can travel to any place in earth without thinking about language and know other countries culture. This is some example we can say in terms of if we have only one language in this world. If we can common language with another country, we can share our experience of life, work, education and etc easily with them and learn from them.
On the other hand, if some languages die out, it lead to die out some cultures with that language. For instance in my country we have Persian language. We have some traditions like Yalda night and noweroz. In Yalda night, we celebrate the longest night in year and in noweroz we celebrate our new year at first day of spring. If Persian die out and we do not have individuals adherent these traditions, this is obvious all of them will demolish.
In conclusion, we cannot prevent to die out languages. But if we like a language, we can learn that language and teach to teen generation. This is a way to make favor in teenagers and it can led to restrain a language.