substantiate ?

Well, the above is not accurate. Internal usage of the term ‘Arya’ by the vedic people as a self-identity of their own ethnicity is attested to in the early texts. It is only later in the post-vedic times that the word changed from a noun to an adjective and started meaning ‘Noble’.

Genetic studies have so far shown that the Dravidian’s are no different to the North Indian Hindus. Both are Aryan. The idea that the tribals of India were somehow pushed into the remote jungles by Aryan invaders is contradicted by evidence that they are the only Hindus of India who escaped subjugation by the invading Muslims. At the time of the supposed invasion in Vedic times, the world’s population was hardly more than 100m. If India had managed even half of that at 50m, it would have been sparsely populated. It is no wonder Hinduism took on the character that it did: the country’s physical geography reflected the amalgamation of all the different influences that shaped it. Much like a virus it has not been able to switch off that characteristic in the changed circumstances in which the country lives today.

The relatively easy going approach of Hinduism has not shaped a country that expresses political unity and identity that has been to match the fast changing we live in. Politics far from relegating caste to irrelevance will leave it to social change for it to diminish in its influence on its body politics.

The battle for the physical unity of Bharat was won right back in mythical times. The one to win it for the soul of the country has hardly begun. Win that is won, we will be able to sing from single a hymn sheet. The fact that it has eluded India for more than a thousand years when epoch changing events has caused the whole to change means that it is a lot to expect. The Hindus could be forgiven when the British overwhelmed them in modern times, but India hardly freed itself with any great distinction. Now it will have to make a transformation with none of the drivers that make for compelling force change. Only a historical accident will change the day.

a very interesting discussion on similar subject
http://blog.shunya.net/shunyas_blog/2008/07/indigenous-arya.html