The Crusher family settling down on Earth doesn't mean they would be out of the series. There is a precedent, the Siskos on Bajor - and they are still an integral part of DS9-R. Maybe Beverly even becomes captain of the Pasteur
a few years down the road, just like Sisko returned to active duty?
Una McCormack being the resident Cardassian specialist could also mean that the story focuses on Glinn Dygan and his return to his people?
Or, the title itself could be placeholder and the story about something completely different.