Rajpal ji,
Sure he concludes that, as this line of study is rather new and does not have all the support of over 70 years of Aryan invasion/immigration storyline that has existed till now. This view is going against decades of deeply entrenched scholarship. Maybe it will be built upon in future. At least we cannot blindly believe (as asserted by orientalists), that Aryans originated from outside. That is precisely because of efforts provided by Bhagwan Singh, B.B Lal, Talageri and Kak to name a few, which people should be encouraged to read and include in debates.
Dr Natthan Singh even provides a very unique thesis to all this by saying that not only Aryans were local but goes a step further. He says that Aryans not only emigrated out of ancient India but centuries later a few immigrated back in (I am sure some in the form of invaders from central Asia). I have to re-read his book to understand it now. It may explain why lot of central asian tribes were assimilated among Jats, Gujars and Rajputs.
In fact, I have not seen anybody come out with a paper recently about Aryan invasion model at all. I think even Romilla Thapar, who was a staunch Aryan invasion theorist earlier most of her academic life, seems to have come around on this concept. I will try to get that paper about it.
Maybe, in this forum it will take a little longer to understand the implications of this view. Evidence for Aryans originating outside of Sapt-Sindhu seems to be eluding, however.
Another interesting book on this issue by B.B. Lal with research focus on a unique topic written in 2005:
http://www.vedicbooks.net/homeland-aryans-evidence-rigvedic-flora-fauna-archaeology-p-13816.html
I would like to point to just one of the animals listed in this book,
Mahisa meaning bhains or water buffalo. Jats will easily identify this animal and not too long ago, every Jat household had this animal. It was an important animal than and is an important animal now too, a continuity. Ravinderjeet recently posted a picture of a bhains which was worth Re. 1 crore (close to $200000) ! That is how dear Mahisa is and should be.