What do you mean by a linguistic state in India?
Linguistic states are the states divided on the basis of language.
Later on, linguistic basis was not the only criteria for creation of new states. Regional imbalances in a region and separate regional culture raised demands for formation of new states, this Jharkhand was split from Bihar, Chhattisgarh was separated from Madhya Pradesh and Uttarakhand was carved out of Uttar Pradesh. These new states were formed in 2000.
Separation of States on Linguistic principles strengthened national unity, since it did not lead to disintegration of India.