Erik Moeller erik@wikimedia.org wrote:
All the clause requires is that contributors commit to licensing their edits under CC-BY-SA in the event that the existing wiki content can be safely migrated, which in part depends on the FDL 1.3.
This is difficult. For example, the Extremaduran Wikipedia test project has been edited by 34 users, some of which are inactive. http://tools.wikimedia.de/~pathoschild/ls-testanalysis/?prefix=wp/ext
If we cannot contact any of these users (or they refuse to relicense), the only choice I see is between purging all subsequent versions of articles they edited, or waiting for FDL 1.3 with its migration clause. It's a choice between a messy time-intensive migration, or a probably lengthy wait.
If possible, it would be much better to leave the content under their current licensing. This would allow us to create the wikis immediately, and migrate them to a hypothetical dual-licensing on equal grounds with other wikis. Approved wikis today have more content than many of our existing domains.