Using blogs like a content management system

Someone suggested that we create a blog for every library faculty member. That way we can replace the static staff directory with blogs that allow the owner to update regularly and syndicate subject-specific announcements to a targeted audience. The idea makes me think about incorporating applications like blogs, which have the mystique of being frequently updated and up-to-the-minute-current, for uses that are generally thought of as static, like a directory. Is it "wasteful" to utilize blog technology this way? Is it analog to using a home theater stereo system to listen to AM radio on headphones? What does "wasteful" mean when talking about software or disc space?