You should read Bryant's book. His basic pov it is that there is little in the way of solid proof for either side of this debate.
Another book you ought to read:The Horse, The Wheel and Language
by David W. Anthony, Princeton, 2007
In partcular you should read the section from 402-411. This entire book adequately supports the claim that PIE evolved in the steppes of Asia among nomads.
The basic point is that language carries culture, not DNA.
So there is plenty of evidence for the fact that Proto IE languge speakers moved into India from outside of it: dna, linguistics, archaeology, etc. These days these kinds of movements can be plotted mathematically on the basis of both linguistics and dna, just as the spread of human language can be plotted mathematically from South Africa to Polynesia. Both phonemic and genetic diversity is densest in South Africa, and least dense in among Polynesians.
Sure, the first people to move into India probably moved there 75,000 years ago. There have been many successive movements of people into India. Humans beings come from Africa, not India.
Witzel owned Frawley because Witzel's Sanskrit is much better than Frawley's and Witzel is a better scholar.
Karma Dorje wrote:
Witzel has staked his reputation on defending a theory that there is no objective evidence for.
The same charge may be leveled at Hindutvavada. Read Bryant.
He has politicized the conversation to a large degree...
So have the Hindutvavadins.
The most damning evidence to the theory, aside from the complete lack of an archeological record which substantiates their fanciful interpretation of veda and itihasa is current genetic analysis that demonstrates that the population of India has been indigenous for at least the last 10,000 years.
This does not prevent IE languages coming from some location in central Asia. Languages, as well as pots, are not people. English proves that well enough.
Whilst at McGill in the 90s, I had constant arguments with Katherine Young and others about this theory which they have all now rejected in light of current scientific evidence. When philology and fact collide, facts usually win.
It is highly unlikely that the IE languages and cultures evolved in India and spread from there. The Hindutva theory is every bit as racist as the Hindutvavadins claim the Aryan Invasion Theory to be.