If you take away the software sections and focus on everyday admin topics it won't matter what the software is. The site I used to have ran vbulletin. People didn't visit the site and post because of the software that I used. They posted because the topics helped them be better admins. With no software centric forums there was no forum software topics. Instead users focused on all the other aspects of being an admin or moderator. The real topics that all admins deal with everyday no matter what they use on the backend.