They could have then used Voyager in a finale that involved the Dominion, and let Voyager be a key in winning the war. Surprise!
No. DS9 was the show that introduced and developed the Dominion, they should be the ones to end the war storyline. Having VOY fly in and end it would have only pissed off the DS9 fans.
Many TNG fans are still annoyed at how VOY mishandled the Borg and Q.
Heck, it was Picard who destroyed the Borg for good in a feature film. And then they took that away from him by having all the Borg up and well in Voyager again.
how did he destroy the borg for good? he just killed a queen