I have no confidence that we will ever see another living DS9 character. The only remnant of the series we will see again is them flogging the dead horse that is Section 31.
And that's fine. The last thing I want is for them to destroy DS9. They need to focus on creating new character, species, and storylines that doesn't cater to nostalgic fans because otherwise you get a bloated mess like Picard. This is why I prefer Discovery and Strange New Worlds.