I can provide a personal reference. Eight years ago I opened a photolab in a new store. Our roll volume averaged 50-6o rolls per day this time of year, and about 100 rolls per day in December. We are in a small town/rural area, in a chain drugstore. When we opened, we had a twelve foot peg backwall filled with film, B&W, slide, even a few rolls of 120 in the refrigerator. Out front, we had a ten foot island with film on one side, Polaroid and disposacams on the other. We carried Polaroid, Kodak, Fuji, Agfa and Ilford.
Today the film and camera section is on a two foot section. That includes the digital camera cards, disposacams, tripods, camera cases, and MP3 players. Oh, and the film, too. No Polaroid at all. No Kodak, only Fuji and our store brand (which is actually Fuji as well). No B&W. No slides. No med format. We carry multipacks in 200, 400 and 800. Singles in only 400. Last week, my film roll volume was 20 per day. Of course, we do about 20,000+ digital prints a month on three dye-sub printers. And I am probably getting a new minilab printer/processor to replace my aging optical system. Which will be great for digital output, but now my film will be digitized as opposed to optically printed, using a lens and lightbulb. Progress marches on.