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We do reserve the right to remove access to our wikis on the very rare occasion when we decide it is necessary, but the GFDL license means that the content belongs to the community, and we comply with that license by making backups of all wikis available on a daily basis. We will be happy to provide more information as it becomes available.
There was obviously some sulkiness in their response, but surely once someone has decided that they no longer wish to avail themselves of a GFDL content, surely there is no ongoing commitment to re-publish for others in perpetuity?
I guess this is a variation of the Deleted Article discussion, but it strikes me that once you have decided that you are no longer using the licensed item, you surely no longer have an obligation to maintain and distribute it. WMF have a problem within Wikipedia in that they still maintain the deleted articles hidden in the database so they are wrongly failing to redistribute them - however, if they destroyed the article, then it is not their problem that they deleted content that was licensed for use, not under a licence to be preserved.