TO WHOEVER THOUGHT THAT TABLETS WERE ACCEPTABLE, YOU ARE WRONG. Try typing with just your index finger.
A tablet style interface may work with a phone, facebook, and youtube. It doesn't work when you are trying to type in searches for materials.
I voiced my disapproval to every librarian that I encountered. (I am sure that none of them made this decision.)
This was a really stupid decision.

Here is a suggestion. Replace half of the tablets with workstations and see how much use the tablets get.