Billu Barber is an Irfan Khan movie in the jacket of a Shah Rukh Khan movie - and thus facing the expectations of a Shah Rukh Khan movie. The left side of that hyphen above means that it is Shah Rukh Khan trying to carry an Irfan Khan movie, and the right side means that it is Irfan Khan trying to carry a Shah Rukh movie. Neither is good news, mostly because it is movie that needs carrying.
The story of Kuchela/Sudama in the Bhagavatha Purana is 1 chapter. You could possibly make a whole movie out of it, but you'd last find audiences for it in 1980, when people were still devout and....