Branden Robinson writes:
Fortunately, it is not as much work as we might fear. At least four GNU Manuals that have recently had Invariant Sections added to them andwere relicensed under the GNU FDL were DFSG-free in earlier versions.Search the archives of this list for "traditional GNU documentationlicense".However, important works like the GNU Emacs manual, _Using and Porting GNU CC_, and _The GNU C Library Reference Manual_ have had invariant sections for several years at least.
That's good to hear. Of course another related concern is forward-looking. It is a terrible waste of scare resources to have Debian create a DFSG-free manual every time a GFDL-licensed manual is produced for some new piece of software. Perhaps this situation will be avoided in other ways such as making efforts to encourage dual-licensing. But for now, I think it'd be best to avoid the situation altogether by seeking common ground. Hopefully something can be worked out.