Tammy Gregorio doesn't waltz away into the sunset — or, at least, presumably heads home once the finale's brass band stops playing and the party is over. This means she's still out there doing her thing. Given her considerable abilities and history of moving between locations and even agencies, who knows? With her experience, she might eventually reemerge in another "NCIS" show as an experienced mentor type. On the other hand, she could eventually turn up to help another NCIS investigator team that ventures into the Big Easy for one reason or another. She's proven that she's more than qualified for either of these roles.
Christopher Silber actually hinted at the possibility of Gregorio exploring new avenues of life in an interview with Deadline, where he discussed some of the potential plot arcs the "NCIS: New Orleans" Season 8 that never came might have covered. "We would have solved a navy crime every week, and we would have continued to explore the lives of these characters," Silber said. "In the context of this show, that would have probably been some exploration of Pride and Rita [Chelsea Field], and Khoury [Necar Zadegan] and Carter [Charles Michael Davis], and Gregorio moving on."
The comment about Gregorio moving on could, of course, be taken in a number of ways. Nevertheless, the character's arc has always been about forward motion. Since she's a capable agent with no conclusive storyline endings weighing her down, there's always a chance she might still have a role in the "NCIS" universe.
