There is no such thing as indic language, There is either Dravidian or Indo-Aryan language.
Indo-Aryan means Aryans from River Indus which makes up all the pakistani ethnic groups that is pushtoon, kashmiri, punajabi, Chitrali, Wakhi and sindh.
Bhartis are neither Aryans nor from the Indus so this term indo-Aryan only applies to Pakistanis.
The word India comes from this territory; and used for it exclusively. Ancient Indus Valley Civilization is based in Pakistan.
Sanskrit literature, mother of all Indo-European language was written about Indus river in Pakistan during Vedic civilization.
The heart of Vedic civilization lies in Pakistan. The earliest Vedic texts were composed
in Pakistan, Sanskrit was formalized and named in Pakistan.
Only later Vedas were composed in the Gangetic plains as some of the nomads moved into
northern part of modern India. A much later development than composition of
early Vedas in Pakistan.
You people are not the original speakers of Sanskrit language, Sanskrit was imposed on you people (the so-called North Indian) by Indo-Aryan meaning Aryans from Indus/Pakistan. Your (North Indian) original language was the same as South Indian language i.e. Dravidian language.