You must be a troll or someone totally ignorant of the archiving process in the real world. From your posts, you seem to think that the entire act of archiving is the digital scanning of an image. This is just one step of the many that needs to be done. A proper archive would log which operator did the scanning so questions can be be made to the proper person. Metadata needs to be logged so that these random digital images have some sort of meaning. Otherwise, it'll look like someone's mobile photo gallery; just a pile of incrementing file names and dates of when the scan took place. Basic information on which roll would be useful. Most microfilm archives like this already have a bunch of information associated with them which is how the librarians know how to find the roll to begin with. Associating the exact same information with this new scan would be a minimum expectation. Which off the shelf software package, retail or FOSS, would you use to handle all of this? Once all of this is completed, how do you utilize the work that you have done so that it serves a purpose? What infrastructure does this require?
In your simplistic concept of drop in a new roll every time someone walks by, how is this getting accomplished?