Could well be; I haven't seen it in a long while.If memory serves, the Dominion was still able to send transmissions through the wormhole, in the Ep. where Sisko takes back DS9, I distinctly remember a panicked line of dialog when the Dominion fleet fails to show up saying something like "I don't understand it! Our post on the other side reports the fleet had entered the wormhole!"
I recall a line about how only 1,500 Klingon ships were resistant to the Breen energy weapon, and that the Dominion forces thus outnumbered them 20:1. So the Alpha Quadrant force was in the region of 30,000 ships.I would assume that it was a significant blow to the Dominion's war effort, I think they could replace the ships and soldiers within a few month's, but not days. I think once the Federation took back the wormhole, they had the minefield back up within a few weeks. I think the Wormhole Aliens probably only made that one fleet vanish, as a "favor" to Sisko.
Now that's after a year or two of wartime production (and losses), so I can buy that the Alpha Quadrant fleet they had at the start of the war was small enough that 2,800 ships was a significant force to them.
But surely if the Alpha Quadrant fleet could be built that big that fast by the Dominion, then their home fleet back in the gamma quadrant must be absolutely colossal. Well over 100,000 ships, if not several times that.
Given that, I can't imagine that losing 2,800 ships would bother the Founders at all. It's likely a tiny fraction of what they have on hand. Given how callous they are, I imagine their first reaction would be along the lines of "Hmmm. Well, try sending another 2,800. See what happens."