Besides the fact that it does look like stackexchange, you have to keep in mind that the criteria to start a new stackexchange are quite high in terms of users/

Besides the fact that it does look like stackexchange, you have to keep in mind that the criteria to start a new stackexchange are quite high in terms of users/questions/traffic. So OSQA can be a good alternative to keep stackexchanges (such as http://semanticoverflow.com http://semanticoverflow.com which lacks enough users to be restarted as part of stackexchange.com) alive which where created at a time as they were still offering private/seperate installations, due to its import ability.