Dravida means belief in "appearance of righteousness". Arya means beleif in "being in righteousness". Appearing can't withstand adverse questions why-what-how-where. Being withstands adverse questions why-what-how-where. Appearing doesn't prevail. Only being has prevailance. So aryans prevailed over Dravidians even though Dravidians are natives in India. Aryans may be migrants to India. But Dravidians must get self-eliminated by aryans now.