It's an important point. Somehow we got by with the limited offerings. There's no reason to give up just because some of the films are going away. We still have much higher quality films than we had then (well, except Kodachrome, but then I'm partial to it), and while I dread the possible demise of E-6, I will switch to the excellent color negative materials if it happens. As for B&W, we should be okay for a long time to come. If a favorite goes away, there will be something else which will give results largely comparable to or better than the films used for most of the iconic images of the last half-century.