The treaty gave peace a chance, and without it, it seems entirely likely more people would have died. From that viewpoint, it wasn't a mistake, though I don't think anyone could have anticipated where it would lead (in part because the wormhole hadn't been discovered yet).
The Maquis were a thorn in the Cardassians' side and did destabilize them, but it was the Klingon invasion that was the real issue, and it seems likely that that would have occurred whether or not the peace treaty had happened.
One element that I feel the franchise neglected and that maybe needed to be shown more explicitly was what happened with the Cardassian planets that found themselves handed over to the Federation. I think there's a tendency to focus on "The Feds sold out their colonies!" without regard for the worlds the Federation gained in the process.
Also, while it's easy to say "Cardassia joined the Dominion", I don't think it's clear how much of the Cardassian people really supported that alliance and/or understood the implications. Given how things turned out, I'm sure many of the (surviving) Cardassians regret that it happened and possibly consider Dukat the worst thing that ever happened to them.
The Maquis were a thorn in the Cardassians' side and did destabilize them, but it was the Klingon invasion that was the real issue, and it seems likely that that would have occurred whether or not the peace treaty had happened.
One element that I feel the franchise neglected and that maybe needed to be shown more explicitly was what happened with the Cardassian planets that found themselves handed over to the Federation. I think there's a tendency to focus on "The Feds sold out their colonies!" without regard for the worlds the Federation gained in the process.
Also, while it's easy to say "Cardassia joined the Dominion", I don't think it's clear how much of the Cardassian people really supported that alliance and/or understood the implications. Given how things turned out, I'm sure many of the (surviving) Cardassians regret that it happened and possibly consider Dukat the worst thing that ever happened to them.