Poisson Du Jour
Member
Since they are colour they wouldn't last more than 20 years max printed as c-prints. At least with digital they can be printed via inkjet which might actually last a bit longer. The media, i.e. the sites you are all giving links to, expect the images that are released to them to be in colour. So frankly I thinks it makes 100% sense for her to shoot digital for the media. And how many of you actually know whether she shot some B&W or transparency film for private images for the Queen. My guess would be none of you know.
What?
C-types e.g. RA-4 will last many, many years longer than 20 years, and many more still conservation framed (e.g. cotton rag mat). Giclée prints on art stock have a similarly legendary span and the German manufacturers are the trailblazers in that regard. "20 years max printed" does not reflect the reality.
It is the Royal staff who decide who shoots what, with what, when and for how long. Who gives too shakes of a ram's curl whether it is analogue or digital. Material/media concerns are not on their agenda, just getting the images, some very high quality prints and then out the door, quietly and without fuss. That AL should be chosen over the more established figures such as Lord Snowden illustrates the high regard the Royal house has of the professionalism of Leibovitz. Previous "dramas".