Knowledge is the power and it gives everything to man, animals, birds all living thing in the world either direct or indirect way. Except man, all living thing in the earth gets knowledge by genes embedded by facing challenges in competitive world for survival, ex, cheetah gets its stealth knowledge from genes, even human being gets knowledge from genes, the difference is the power to record, communicate and share the knowledge acquired using the powerful tool, process a Language. Using Language, the acquired knowledge can be shared with other and this helps further improvement to knowledge.
According latest studies, one of the oldest language in earth is Sanskrit and it is said that it is the mother of all languages in earth. All Indian languages is driven from Sanskrit and as time moves each languages evolved differently and new word created and the pronunciation of the words is changed according to geographic region and people requirement.
Because of the availability of the different languages, people started speaking the language that is more prominent, respectable, that suites for business in the geography of living. Over a period of time this isolation made people to know only the language that is used for business and gets respect. One way this helped regional language to develop in a comprehensive way and made much stronger.
Now, as technology evolved, the mode of the business that drives people life is also changed, again, the language that is most common and gets treated as respectable, most people known and the language gives more knowledge became the universal language. Unfortunately this is where the start of declining the use of regional languages, naturally this decline in use made languages to loose its credibility and the people started using most easy word from the native language and started using a universal language as replacement for the difficult work in regional language.
The use of Universal language with regional language is the real killer for regional language and really made people to forget the regional word that is replaced by universal language and unfortunately there is no way to stop now as business is everything and business is do not have boundary, or its boundary is increased to many region.
Now the Universal language is English and it is the effective language for global business as well. At least in India, it is one of the respectable language, because of this reason, the native language is loosing its credibility and it is on the way to destroy from the same region and people who developed the native languages and made it stronger.