Why would you go from film to stale digital
far more processing options.
Larger shooting capacity on memory cards than rolls of film.
Better low light performance.
No use of chemicals.
No hours of waiting to see results.
Easy multiple off camera flash capability.
Ability to easily switch between low ISO and high ISO. (And faster than switching film backs)
Ability to switch between B&W and color without having to change film.
wireless remotes.
higher FPS and continuous shooting modes....
I dunno, I feel like I'm missing some stuff, but since you asked, there's just a few reasons someone might switch from film to digital.
Hope that satisfactorily answers your question.