Given that Sisko's fate is a mystery it can be comfortably ruled out that he returned to Starfleet duty if he ever did return. I'm okay with this because for me personally, no one has been able to write that in a satisfying way.
I'm more open to the idea that he returned and lived off the grid but him deciding to abandon his duties as emissary and a starfleet officer is something I will need to be persuaded on. But I do offer myself to be persuaded.
Tackling this story will not be easy and while I do have faith in Beyer and Newsome as two very passionate fans themselves I'm also a deep lover of DS9 and the tragedy of its finale is so beautiful that I don't want it cheapened. What You Leave Behind makes me cry every time and as someone who grew up in a single parent household it always prompts me to immediately check in with my dad and make sure he's okay. The finale reminds us to cherish the moments we have and hold on to those we care about while we have them and Sisko returning and just living happily every after is less comparible with that message when done clunkily.
I know this can be a point of contention, especially for those who view it as a racial stereotype and not the same way I do, so I do make the promise in writing that I will be absorbing this episode with an open mind.