Doug: It's likely that film, at least in 35mm and probably 120/220 form, will be available for the rest of our time. I would not be quite so optimistic of the futures for sheet products.
Nevertheless, the market for consumer film products has shriveled approximately 15% per year for the past 5+ years with no end in sight. (Film's biggest commercial market, movies, is also just beginning to shrink as digital video production and distribution takes hold.)
That's clearly not an encouraging market to enter or retain. I expect Kodak to maintain at least a foothold in film for the foreseeable future regardless of its dwindling profitability; it's their publicly recognized heritage and the losses are controllable. I also expect Fuji to remain in film for the foreseeable future. They, like Kodak, have a substantial investment in this market which requires very little marketing or nurturing.
The growing challenge for emulsion-lovers, however, may be getting their images developed. Chemicals for home development of b&w film might become harder to obtain. Labs might also become harder to find, particularly if the drug chains and suburban super-stores cut back on their processing services. (These services are, after all, only offered to get people into stores where they might potentially also buy Huggies, beer, or tampons.)
It's interesting to also note that film is still seen by many consumers, particularly middle-aged women, as the simpler, more fuss-free medium.
So film will be around for the foreseeable future, also perhaps with less convenience.
