Probably will give this a try with a few colleagues and see if it scales when you accumulate a larger amount of documents.
I can say that we've reached about 500 pages in our team and it's still working great. Nevertheless, we definitely plan on introducing more advanced organization and visualization features for teams with large amounts of documents.
Currently, we don't have any importing functionality, but we'll work on that in the near future. It might also be possible that we will provide an API that allows users to create custom import scripts for arbitrary file formats.
What kind of export would you like to see? Exporting the whole content of a team as HTML, generating PDFs for all the pages, generating Markdown files? Any preferences?