When Doordarshan was the only television channel in India, programs like Chitrahar and Mahabharat or Ramayan attracted every television watching audience in one channel. I can also remember 'World This Week' by Prannoy Roy.
Then Cable TV happened, channels multiplied and audience fragmented.
TV channels unite as one for Tsunami cause
On 6th and 12th February, news channels and Hindi entertainment channels (respectively) are coming together to broadcast a single program, with same ads across all, to generate money for the Prime Minister's National Relief Fund.
It would be an interesting experience for the mainstream Indian television viewer. The Tamil viewer still has his Sun TV to Win TV showing local fare.