See also https://creativecommons.org/board , https://creativecommons.org/tag/ceo
It's important to note that CC has dozens of independent national "chapters" (affiliates https://wiki.creativecommons.org/Category:Jurisdictions ), many of which are university centres/departments; some are rather big and do international work as well, like NEXA ( https://wiki.creativecommons.org/Italy ).
It's impossible for them all to collapse at once; in case of fatal emergency, it would probably be comparatively easy to transition the barebone CC infrastructure (main trademarks and website) from one org to another.
Nemo