Ask yourself how long digital photography (as in true photography) is going to be around rather than wonder about MF film. Most new digital cameras have got a 'movie' function, it won't be long before you just film everything in high resolution at 30 frames per second and pick the frame you like. Most high end digital cameras will be in the recycling in a few years time, so huge depreciation even though they can take quite nice pictures, while most film cameras will still produce superb images for decades to come. I think that MF and LF is less at risk than 35mm, plus using film is a whole different way of looking and creating. Each frame is precious because it is expensive, you get the best out of each one, you look at it, evaluate it, and improve next time. I was in a bird hide at the weekend with someone using some monster digibeast with a huge lens on it, and in the 10 minutes I was in there he took 50 pictures of the same squirrel sitting in the same place. What is he going to do with 50 pictures of a squirrel? I didn't take any because it as a pretty scruffy looking squrrel in a bad composition. I'd call that pre-visualisation.