Language and culture are sensitive and emotional issues. We all have grown up with certain set of ideas and it will be difficult to give up our clichés when somebody suggests anything contrary to our coveted opinions.
Anthropologists are almost unanimous that early man originated in
Dravidians as well as Aryans have settled in
It is just like the comfortable experience we enjoy in the house or the town in which we live and wherein many of our ancestors had have lived. Just because several generations of our ancestors lived in this house or town and etched unforgettable pages in the history should not mean that at some point of early period of history, one of our primal ancestors came from some other town and settled here.
If we believe that human populations migrated, it is taken for granted that the proto languages they were speaking and the cultural habits they were accustomed to also migrated with them to different parts of the world.