The fence is virtually worthless. It was built to demark a line of surrender for the Jews to the Arab League. Fences do not stop mortars, or ladders.
Jerusalem has no fence and the bombing has stopped there too. Fences that are not built do not stop terrorists. If the places that have no fences also see no terrorists, then it is ludicrous to say the fences are stopping terrorists where they are built because there have been no attacks there.
Terrorism has stopped because the IDF has been going into the vipers nest to pull their fangs. When the surrender is complete and the IDF are no longer allowed to pull fangs because the fence becomes a state line, then we will find out how good the fence is, or is not.
I think the fence is going to cause massive terrorism when it if finally completed, physically and politically. It will also cause one hell of a war.