Pretty much all imagery shot on film should have archival value.
As time goes on and generations pass, film reels may be viewed as old school and not worth keeping, especially if the footage was previously transferred to video, however, this is moreso a rationalization than truth. If one simply looks at the amount of video being created in 2026, versus what was created on film 75 years earlier, film will retain an intrinsic, archival value. Additionally, ongoing improvements in digital video also means retransferring older films can reproduce an even higher quality resolution than when the archival film was originally transferred. I would suggest never throwing out old film, since as time goes on, the historical value of the film keeps growing by leaps and bounds. Each country in the world should have a way to archive all film material related to their country, whether they do, or don't, is another matter.