I don't think it needed another season, but it would have been nice to have gotten some more resolution to the war. I know I'm not the only person who thinks they should have maybe wrapped up the Dominion War with a few more episodes to go in the series. Give it a little time to sink in, see some of the aftermath/celebration/repercussions before moving on to the Sisko climax and wrapping up of the individual storylines. All of those things felt unnecessarily rushed. They could have done all of that without another season.