to give a more precise answer, WRT the FSDG, i believe that the only requirement for on-going maintenance, is that the maintainers must accept bug reports for freedom bugs, and address them promptly - so, the only justifications for revoking endorsement, would be one of:
* it is no longer available * the maintainers can not be contacted * it has freedom issues, and the maintainers will not fix them AFAIK, none of those apply to dynebolic
