Since 80´s we´ve got two MU stories which dealt with Empire coming to our universe to conquer us. MU Saga and Dark Mirror. Both of them were in separate reality to each other and DS9 made them not "anti-canon". But the idea is still potentionally kicking. Would you like to see some sort of resurrected Empire trying to get foothold here? After all, experience of Mirror Spock taught them that pacifism can be dangerous... Of course it should be some sort of subtle conflict not comic-like action. I personaly would love such a thing.