This is your own assumption. Hindi even if declared official language, is hardly the only language for movie-goers. At least I am not ignorant as you otherwise I could say Hindi-movies are watched only in the Cow-belt area where leave alone theatres, there are not many tents to screen them in. I will not say that. So instead of pouring your blind-anti-south feelings, accept the fact: 3 major industries for movie: Telugu, Hindi and Tamil. (this is as per cold statistics- not blind emotional crap)