proto-Dravidian and Elamite

From Science Magazine, Volume 294, 2 November 2001, page 989:

"In India, for example, Renfrew and Bellwood
have proposed migration pathways
from the fertile crescent—where the Near
Eastern agricultural "package" of wheat, bar-ley,
sheep, and cattle originated 10,000 years
ago—along the Arabian coast, reaching India
as early as 8000 years ago. The hypothetical
Elamo-Dravidian language family—which
includes the Dravidian languages Tamil in In-dia
and Brahui in Pakistan, and the extinct
Elamite language in Iran—shows a nice,
sweeping distribution in the
same direction.
Dorian Fuller, an archaeo-botanist
at University College in
London, offers a different story.
His excavations show that indigenous
southern Indian crops such
as mung bean and foxtail millet
appeared in southern India 4800
years ago, with wheat and barley
arriving 600 years later. The Near
Eastern crops apparently stalled
for 3000 years in northwest India
before farmers developed
monsoon-tolerant wheat. Also
undermining Renfrew's hypothesis
is new work on Dravidian linguistics.
Preliminary analyses
suggest that the Dravidian words
for native southern Indian crops
are older than the words for the
Near Eastern agricultural package.
So Dravidian may be native to India and
unrelated to Elamite. " QUOTE ENDS

What are the implications of this suggestion, from a linguistic
perspective? If the above is true, how are the supposed PIE-
protoDravidian correspondences impacted?

Sincerely,

Vishal Agarwal