If Goran'Agar succeeds in killing his men, he'll be trapped on the planet for the rest of his life, with no enemy to fight and stewing over his failure to save his people.
He still should have the ship they took there. So he could leave.
On the bigger picture and considering the Dominion War… how many lives, did O‘Brien’s shortsighted descsion to destroy the cure cost in the long run?
