It reminds me of an article i read, relevant to animation too because of the "blurring effect" that happens when you degrain a film, maybe Disney want to re-make The Blur Witch Project.
Roger Deakins who was the director of photography on The Big Lebowski and other Coen Brothers films has this to say on the subject matter.
"I would prefer to scan everything at 4K these days and output the same, however, it seems some producers still want to save money by doing 2K. Personally, I think this is very short sighted and certainly does not reflect the true quality of a properly exposed film negative. I insist on 4K scans, as I like any grain that there is to be sharp and the image also. Some would say that you need a 6K scan to see the full detail/fine grain in a 35mm or anamorphic negative and I believe they would be right. The de-graining tool is really only putting the image out of focus and I wouldn't recommend it as standard. Like every tool there are pros and cons. Everything comes at a cost!"
Wonderful comments. Where does Deakins say this? Link?