Will I be common in 50 years? Not unless they come up with a total body transplant soon!
Regarding film, I think it's totally an economic issue. For the general consumer, who wants everything quick and easy, I'm convinced that digital will totally dominate the market very soon.
For the professional (maybe) and the art oriented photographer, there will still be a market for film, but, as suggested it may be small and "special order."
You can still do platinum prints, but the corner drug doesn't stock the supplies.
In retail photography, money rules.