Professor David Crystal, one of the world’s foremost experts on English, said people will effectively have to learn two varieties of the language - one spoken in their home country, and a new kind of Standard English which can be internationally understood.
The English spoken in countries with rapidly-booming economies, such as India and China, will increasingly influence this global standard, he said.
It seems grammar and usage are also dynamic entities of language and bound to change with time.
Here are some interesting articles on the same
Amardeep Singh: Indian English -- Does It Exist? What Do We Call It?
Thank you, come again - Indian English set to become major dialect | Über Desi