Dear JK, Sanskrit has never been the language of the masses, at least since the time of Buddha. Some years ago I read somewhere that vernacular literary works to be initiated into the scholarly circle, they must be first translated into Sanskrit, and the translated Sanskrit work must be treated as the original.
George Hart of UC Berkeley, who occupies the Tamil Chair there, who is a scholar in both Sanskrit (his Ph.D is in Sanskrit) and is no stranger to the Tamil/Sanskrit politics, and one who is married to a TB, says the following:
"From the beginning, elegant Tamil has eschewed Sanskrit words and encouraged the use of pure Tamil vocabulary, though of course Tamil has still managed to borrow an enormous number of Sanskrit words (just as Sanskrit has borrowed many Dravidian words). Once, reading a hymn from the Rig Veda, we found that virtually every word is found in modern Tamil...For formal Tamil, one must use words like நண்பன், தூய்மை, ஒளி, ஆண்டு, and these pure Dravidian words impart an elegance that is entirely lacking when Sanskrit words are used."
I have more observations of George Hart. I will share them with the forum a little later ...
Cheers!