In the film Star Trek: Insurrection, the main antagonists are the Son'a, a species that is an offshoot of the Ba'ku species.
Apparently, there weren't too many Son'a that left the Ba'ku. During the events of Star Trek: Insurrection, it appeared to me that most of the So'na were either killed or returned to the Ba'ku.
However, during the final season of Star Trek: Deep Space Nine, either Weyoun or the Female Changeling (I forget which) mention receiving help from the So'na in their fight against the Federation. I assumed that the amount of So'na that initially left the Ba'ku was somewhat small, and that they didn't reproduce that much, if at all.
Am I incorrect in my assumption? How many So'na were left to roam the galaxy after Star Trek: Insurrection?