User blog comment:Cyrus Arc/Sorry for my absence and General Discussion/@comment-5746209-20130722081127/@comment-5259531-20130727143939

Those were not the only members of the Insurrection. They were only the ones that made the most prominent appearances. In episodes such as The Twins, The Sarcophagus and Spiral there were many low-ranking Insurrectionist 'Grunts' seen, so it is entirely possible that members of the Insurrection are still around, just not the major ones that you mentioned. Although I doubt they would be operating at anywhere near the same scale as the Insurrection did during the backstory.