I [should] explain myself: in the case of a liquidation (if the FSF went bankrupt), the successor could close-source all of the GNU code, because it all belongs to the FSF.
More precisely, the successor organisation (as owner of the copyright title) could issue additional code instances under proprietary licences. Recipients of the existing instances would immediately fork off the earlier codebase and continue exactly as before -- classifying the successor group as damage and routing around it.
A few people have asserted that the new copyright holder could in some fashion retroactively terminate redistribution of the existing codebase instances and development of derivative works, but I'll believe that when I see a relevant appelate court judgement.
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