How likely is it that the Indo Aryan invasions into India never occurred, but a process of Aryanization took place whereby the elites of Indian society adopted Aryan traits (e.g. sanskrit, the caste system, etc)?
I personally don't think this theory is true as it's rare to find people willingly submitting themselves to something as terrible as the caste system.
I personally don't think this theory is true as it's rare to find people willingly submitting themselves to something as terrible as the caste system.