Who knows? Honestly, unless the writers detail just why it happened, all we can do is guess. I don't even know that they'll address the topic. Now that the story is over, they're going back to the TOS time and dealing with Kirk and his crew, so we may never know.Sparky Prime wrote:Hard to say, I don't recall them ever actually mentioning when the Dominion first became aware of the wormhole in the series. Although I do remember there was a race on the Gamma Quadrant side that also had a mythology based on the wormhole, so that was not exclusive to the Alpha Quadrant side. And on one of the DVD behind the scenes features, the writers talk about how they had this idea the Dominion had been aware of the Federation even before the discovery of the wormhole, but they weren't going to do anything about them until they reached their space, which the wormhole only expedited. Even from what we see in the show, ships had been traveling through the wormhole for about 2 years before the Dominion made themselves known to the Federation. They were in no hurry to confront the Federation, so why would that change in the altered timeline?
It's been a while since I watched the DVD extras. I remember that they started name-dropping the Dominion during the second season, and had the reveal at the end of that season, but I can't remember if it was ever stated when the Dominion became aware of the Federation. I sort of vaguely remember what you're talking about with the writers discussing that topic in the DVD extras, but I can't remember if that ever made it into a final episode. It certainly could have.