Forgetting about slide projectors.
The arguements of whether or not there will be slide film in the future have to also take into consideration of whether or not there will be slide projectors. As projectors break, there will be few places you can get them fixed or buy new ones. I love my Kodak Carosel (how ever you spell it) and I did love my Kodak movie projector. The movie projector stopped one day while viewing some old films. Yes, I will be able to see my slides, but the day will come when slide projectors are as common as Kodak Pocket cameras. This is really the story with digital cameras too. The old film cameras will some day cost a small fortune to get fixed, and why would you bother? Few companies will be making new ones, and like the weakest link in a chain, they will decide when film will finally end.