Thank you for taking the time to submit your feedback.
We definitely will build export functionality for the knowledge base. However, I don't know when we'll have the resources to do this work. Right now, our teams are focused on finishing the multi-language knowledge base features, multi-language blog, and some other projects to improve content management throughout the content tools. So even though we do plan to build export functionality, I am going to mark this idea as "not currently planned" (emphasis on currently!) because we've not yet decided when the work will be done.
I'm sorry, I know this is disappointing. This is one of biggest needs for the knowledge base, and we will keep it top of mind as we plan for KB's future.