It could certainly slow searching by topic (since patrons are remixing the books based on whatever way they're using them). It does seem to demand quite a bit of infrastructure, adding RFID scanners to every shelf (and keeping them working). If it truly would allow every book in the collection to be pinpointed in realtime, that would be a plus, many times the catalog can only tell you that the title you're looking for should be on the shelf, not where it has ended up.