Your this post somewhat becomes an answer to this post.
Even if the Regional Content creators produced/make good shows then, They need the confidence in their content to face larger audience.Regional Producers have to serve a minor audience compared to national audience.Hindi Language audience is the among the largest in India compared to other languages.
There is a cost of dubbing involved for this regional shows to convert to Hindi.As the number of episodes is huge the dubbing cost will also increase.As International Shows like Korean Drama have less episode dubbing is feasible.The audience should also be ready to accept the dubbed content with inappropriate sync and dialogues.
The Channels should also buy/encourage other region content on their mainstream channel for a larger viewing spectrum.
If the above points are not feasible for producers and channels.The viewers are left with very less shows which actually standout even with such a rich heritage and culture.Finally The viewers are not aware of good shows because of Language Barrier,No Variety in Shows by channels and No Regional Content Creators National Exposure.
Movies like Bahubali and KGF performed well in India because of Producers like Dharma Productions which helped in promotions.