Posting such an idea can get you seriously flamed on some sites.
There is a whole group of Indians who for some obscure reason believe that saying the Aryans invaded India from Central Asia in the distant past is somehow insulting to India. They instead prefer a scenario where the Aryan languages originated in India and went west from there.
This is despite the fairly obvious fact that we have archaelogical and historical evidence of dozens of invasions of India from the northwest and exactly none going the other way.
I've never understood why they react this way, as the most common theories have the Italics, Greeks, Celts and other Indo-Europeans originating outside (western) Europe just as much as they do outside India.
There are a few interesting theories being thrown about:
http://en.wikipedia.org/wiki/Out_of_India_theory