#No
No
The basic reason is simple: most people on the earth speak more than one language. There are many places where there is one local language that you grow up speaking with your family, and another 'global' language that you use for business or communicating with the outside world.
In Africa, there are many local languages, but many people speak a regional language like Swahili, Hausa, or Dyula; or a global language like English, French, or Arabic. In India, there are many regional languages but most national publications are written in English. Only about 400 million of 1.2 billion Chinese speak Mandarin as their first language. Even people who grow up with a global language as their first language often learn a second one, like the prevalence of English speaking in Mexico or France.
So because most people can easily learn two or three languages, there is no need for people to limit themselves to one. Given people's proclivity for maintaining group culture and identity, it is next to impossible to think that people will abandon the languages that make them distinct.