This is a realy bad idea. Of course I fully suport open source and self-hosted alternatives, but there are really good reasons for using the Stackexchange system. They will not only do all the hosting and management, but they'll help you find co-admins for the site and work out if there's actually a market for your chosen topic. If there's not a market for your chosen topic then there's likely to still be places you could ask questions like Quora or one of the existing Stack Exchange sites or Metafilter.
I can see this posibly being useful in a closed enterprise evironment when you want a way of helping coworkers solve problems. Maybe. But in that situation there's probably going to be a better way.
I can see this posibly being useful in a closed enterprise evironment when you want a way of helping coworkers solve problems. Maybe. But in that situation there's probably going to be a better way.