am not a specialist in this field. But as an interested student, I
can say that it answer many of the problems philologists have faced
and raised for around 200 years. It also settles the question of the
cultural unity of India. The Aryans and the Dravidians together
shaped the languages and culture of India.
Many other peoples named in the
Rigveda are associated by other ancient Indian texts with other
parts of India. In one hymn (VIII. 5.3739), for example, we find a
reference to the Cedis and their king Kasu. The Puranas point out
that the Cedis were Yadavas who migrated northwards to Bundelkhand
from Vidarbha in northern Maharashtra.
The poetess-composer of the Vedic
hymn (1.179), Lopamudra, wife of Agastya, the great rishi known to
be father of the Tamil grammar, is declared by every single ancient
Indian text to be the daughter of the king of Vidarbha. Thus there
were Aryan speakers in northern Maharashtra well before the
composition of these hymns.
All in all, the Rigvedic hymns, in
combination with the other texts show that the Indo-European
language speaking people of the time were not restricted to the
Punjab region, but were found as far east as south Bihar and the Bay
of Bengal, and as far south as Maharashtra. This is, more or less,
the geographical extent of the Indo-Aryan languages to this day.