I've watched the episode several times lately, since I've been pigging out after buying Season 7 last week.
It really was a weak line and too much of an obvious setup.
Funny, other than Ezri's talking to Worf, I thought that line was the best line in the episode. Was it obvious, maybe, but it was true and too the point. Also considering the history of Bajor and Cardassia, it was almost a line that needed to be said in that context.