It's great to see Bruce Holsinger's essay in print. He was telling me about it at UVa.
There has been steady engagement by medievalists with OOO, for many reasons. But perhaps most of all because OOO reconfigures the consensus about what the "middle ages" might be, philosophically speaking.
When I first got into OOO I spent a lot of time reading medieval and in particular Arabic philosophy. There are intuitive parallels, because of the Aristotle. The dismissal of Pre-Kantian stuff as scholasticism, and indeed the term "medieval," are clearly pejorative symptoms of what has happened in the last two hundred years.
In Past Talks there is a graduate class at Rice from 2010 that I taught on this theme, funnily enough.