There are a lot of rants and raves (mostly rants) about the bookbinder; lack of queue, escalating book costs, strange production times of support buildings etc.
I'm thinking that, rather than fixing all those issues, they could keep those quirks and just remove the limit from that building instead. Let the players decide for themselves how many they wanted to build.
One or more extra bookbinders would need extra support buildings and therefore economies would need to be balanced to accommodate each new bookbinder.
It would even be feasible to add a limited 3 deed versions to gem store... people could save a licence by using one, or just top up their number of them with gem bought ones.