One of the biggest benefits of the digital format is the ease and lower cost of distribution. Sending around an encrypted hard drive is a lot easier than transporting and setting up multiple reels of film.
And there's also the fact that many film projectors have been replaced with digital counterparts. So with Star Wars Episode VII: The Force Awakens being shot on 35mm and 65mm film, where are we going to be able to see it?
For the most part, screenings of The Force Awakens will be a digital transfer anyway – even in IMAX theatres. Despite it being hailed as the #bestformatever, only 1% of the theatres in North America will be showing the full IMAX experience and only a reported 15 theatres in the world will have the 70mm IMAX format.
Every other IMAX cinema will be showing the Digital IMAX version, which is barely any larger than standard cinematic widescreen.