This is nonsense. If the states had not been divided, the Mallus, Telugus and Kannadigas would now be fighting for their rights outside of Tamil domination under the old Madras Presidency.
Linguistic basis for states give local cultures the oxygen to take pride in their past.
Exclusionist politics such as those by thakerays, vatal nagaraj and vaiko are just that - extremist. They do not disprove the wisdom of Nehru-Gandhi's actions.