My personal experience, I was able to easily get seats in DNR-SC to my surprise. Before that, I travelled in sleeper in Telangana and it was quite empty.
But even, I don`t think there is any other feasible destination within 500 km from NGP so would like NGP-SC VB to start soon.
It should start from SC in the morning so as to avoid cannibalize the Telangana and SBC rajdhani.