Why Don't They Try for these Stories?

It seems some of the genres for movies' scripts have been forgotten by the cine writers as well as the heroes. Though sufficient mass entertainers are being made by the makers, the following kind of genres are not being even thought of them. 

* Detective movies are completely kept away. Once remember 'Yugandhar' character in Kommuri Sambasiva Rao's novels. How interesting it is!

* Movies based on the stories of secret agents are not being made. 'Shadow' in Madhubabu novels, 'Bullet' in Panuganti novels are the best literary works of this kind. 

* Writers such as Seehamsetty, Dasari Subrahmanyam etc. had got eminence through their fantasy( Jaanapada) novels. Movies based on these kind of stories will definitely work out well at the box office.  

* Chandamama stories give sufficient stuff to cine writers for the preparation of their scripts. 

PS: Recently one of the film directors said above scripts are the faded out scripts now. However, analysts say, their attitude in fact is a faded out one but nothing else. However, directors like Rajamouli are exceptions as they know the secret of a true entertaining film.