Certainly not a language as complex as Vedic. There is no other logical way out other than evolution.What prevents someone from inventing a language for the sole purpose of preserving the information contained in the Vedas?
Is there any evidence the Vedic people did not speak Vedic? There is no evidence on either side. But for the Vedas to have been intelligible to the Vedic people, they must have spoken it. That is why we (after thousands of years) still are able to study it. That is why Sayana could write his bhasya after thousands of years. Yes, Vedic was most definitely spoken and understood by the Vedic people.Is there any evidence that anyone spoke Vedic Sanskrit ?
On the contrary, what is not logical is the contention that Vedic was merely a written language and not a spoken language.
The very purpose of having intricate rules of preserving the Vedas and the error-correction mechanism, was probably that they could not be preserved permanently in writing, and so had to be guarded against corruption as they passed from mouth to ear.What this means is that we have a people who were capable of an extremely intricate and advanced language (starting from the arrangement of the alphabet to myriad grammatical rules) to encode the Vedas, but did not know how to write!
The Indus Valley script has been found to not be a script at all. They are rather pictographic inscriptions, not a language. This is the latest position. This coincides with the already existing notion that Vedic was also not a written language in the early vedic times. So the Indus Valley people who did not have a written language were in fact the Vedic people who had only a spoken language without a script.What is furthermore absurd is the Indus valley civilization. If we are to believe the AIT and its variants, we have a civilization that was vast in extent but has not left a single piece of literature even though they had a script. Is there such a parallel anywhere ? And the double whammy is that the supposed "Aryans" who apparently were illiterate, have left us the Vedas.
The validity of Proto-Indo-European needs to be accepted only by linguists. Others are merely ignorant bystanders whose opinions on the issue don't matter.It is "universally accepted" by linguists and not by others.
This is called "petitio principii". The Vedas are definitely more ancient than any of the bhashyas on them. So ancient, in fact, that they became archaic even before the Sarasvati dried up and before many of the Upanishads were composed.The problem with that statement is that it reduces the Vedas to triviality. If revelations were obviously visible and straightforward and easy to understand, then there would be no need for the massive corpus of commentaries (bhashyas) and no need for the six darsanas of Indian philosophy.
Simply because only human compositions are expected to contain such verses.And why should that be exclusive of revelation?
Modern scientific standards lean more towards the claim that the Vedas were preserved orally for centuries before they were first written down, than towards the claim that they just appeared along with the Vedic language lock-stock-and-barrel.This is only a conjecture which cannot pass muster by any modern scientific standards.