Robert Rohde writes:

As Greg already noted, motivations/intentions matter a great deal when the license has an open ended "or later versions" clause. If a court found that the license actually meant something other than what the Creative Commons had intended, then they could simply write a new version.

I'm not sure how Creative Commons would have even the theoretical unilateral power to do this without FSF approval. What we are talking about is harmonization of CC-BY-SA with FSF's GFDL.

--Mike