I don't mean to beat a dead (or at least well-informed, but sickly) horse....
Film will most certainly be around for a long time. 120 film may get hard to come by, because it was a film size oddly dominated by professionals for decades. 35mm on the other hand will still be available, if not widely.
Thanks to the internet, it is easy to pick up odd things from just about any country on the globe, and therefore it won't be hard for a distribution network to stay in place for any niche that might exist. As mentioned, if buggy whips, vinyl, etc. is still available.....
That said, I wouldn't make the mistake of saying "film is still prominent in many parts of the world;" many parts of the world are experiencing a societal change not unlike Germany and Japan's in the 19th century, and Russia's in the early twentieth: they leapfrogged the development process that England, France, and the US went through, and moved straight to modern practices.
Countries like India, China and Malaysia are doing the same thing....rather than going through the slow, painstaking process of pencil-pen-typewriter-computer, they're simply moving from the pen to the computer. I just did some bios on students from Thailand for my overworked wife, who works at an international exchange program....all the paperwork from those "poor" kids had pictures of them holding nikon dslr's, some of them with a pig walking in the background. I should also mention that all of those application forms were edited together on computers....
And it's also important to mention that those places that supposedly still use mainly film never used that much film in the first place. I'd be willing to bet that kodak's best customers in Africa were the tourists from Europe.
But, I'm giving that dying horse a firm beating now, this has all been discussed ad nauseum already. The point is, film will be around for a LONG time, if not indefinitely. It will certainly not be available in your corner drugstore like it was 10 years ago, but it will be available in big cities, and on the internet. Fear not, good sir, you have plenty of time for exposing little particles of silver.
And now I'm going to make a late-night run to the grocery store to return some defective beef! (I wonder if it was a defective cow?)