I think everybody is forgetting something. There is really no question the Hizbullah/Syria/Iran can be handled conventionally. But Syria has hundreds of missiles that can target Israeli population centers with WMD payloads. Iran has tens to hundreds of missiles that can do the same. It doesn't matter that we could take these guys out conventionally, its what they might decide to do in their death theros that worries me.
Syria would ceast to exist for all of eternity in that event, AND THEY KNOW IT.