A librarian's job is to archive and retrieve information. For them, having to physically unshelve and reshelve books is not an act filled with nostalgia and romance -- the novelty has long since worn off. Moving books around is a tedious cost of doing business. It's what they make the new interns do. They won't miss it any more than grad students will miss photocopying journal articles. [1]

(God, do you realize how much of my life was wasted lugging giant bound journal volumes around, shlepping them on and off of photocopiers, just because I went to grad school five years too soon? You young whippersnappers don't know how easy you have it!)

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[1] With the important caveat that librarians are not at all impressed with the archival quality of electronic media. There's nothing like being handed a truckload of seven-inch floppy disks and being told to preserve the contents for the next 500 years. The job has its challenges.