Yeah I remember using OTR on kopete when I was in college. I had one instance opened on my laptop and the other on my PC. It was pretty cool and easy to set up. What wasn't easy was finding anyone I knew to talk to with beside the few other linux nerds at school.
Nobody is using this solution either, and setting it up is harder than setting up OTR (provided your conversation partner is already using an app for XMPP).
I can explain my girlfriend and brother how to enable and configure OTR. I would have a hard time getting them to execute the instructions for this addon.
So, I guess, it's a bit more than nobody.