there would probly be no ds9 as we know and love it if he were still involved at that point
He absolutely (and rightly!) would've made damn sure Section 31 was never a thing.
That alone would've almost been worth the laughably absurd stuff like parents would never fight with their children.
How the Federation or other powers might interact with a permanent presence of much more technologically and culturally advanced people in their corner of the galaxy would certainly be a different kind of story for Trek, and could be interesting if handled very well. And it's certainly one that would not fit as well into the picture of the galaxy established by the movies and TNG that's closely analogous to real-world global politics. I don't really know how you make that interesting as a story element, but there's potentially interesting stuff to explore there.
How they would interact is "not at all" given the First Federation's reluctance to maintain contact.
And this was slightly after the Federation council approved genocide (and a bit before they did again) so they were probably right to stay away until the Federation realized that was, you know, horribly wrong. Which is apparently something they still haven't grasped as of DS9.
Edited by MrBlud, 22 September 2019 - 03:03 PM.