Juan, any product will disappear if too few people buy it. At some point, well before the number of buyers falls to zero, the sellers will decide they can get a better return on their money elsewhere.
I said in another thread today that I thought film would die a slow death over the next few decades. I'll stick with that, at least as it regards film as commercial product distributed via traditional retail channels. On the one hand, we will see digital capabilities increase while costs drop. On the other hand, film costs will increase while choice and variety decrease. Those of us who use film are fortunate that Kodak, Fuji, et al, presumably paid for their film manufacturing facilities long ago.
If film can be made on an artisanal basis, then it might easily last forever, with sales and marketing handled by the web and distribution by the usual suspects. it won't be cheap, though.
