RA4 paper will be available for longer than C41 film, as long as environmentalists or political regulations do not kill it for some stupid reason.
But I doubt that future RA4 papers will be compatible with analog printing.
Digital cinema: in "rich" countries, the transition to digital projection is almost finished. "Poor" countries will quickly follow, just at lower quality. Color film is already a niche product, and the decisions if it will survive more than the next 3, 4 years have certainly already been made - they just won't tell us before...

Georg