@Zeal
Right after independence, the thought was to implement 3-language system all over India - mother tongue + English + Hindi/another Indian language if mother tongue is Hindi. Most southern states did it. Except, Hindi belt still hasn't. I learned Hindi rom Class 5. How many from Hindi heartland learn a southern language?
2ndly, Hindi being given importance would leave the rest at a distinct disadvantage where official business is concerned. For ex, admission tests. Because there's always going to a difference between how a native Hindi speaker uses the language versus a non native. Which is why southern states to this day insist on English.
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