Israel cannot remain hostile to half the world and survive. We are in the age of WMD already and as we move farther into it wmd's will become smaller and more readily available. Sad to say, but this is called progress and weapons progress is especially fast. In one year or ten or twenty. It is most unlikely that a nation will target Israel with a wmd. It will more likely be a group. The timing and the attacker are irrelevant. The end is easily predictable.
At least 1,000 Israeli Arabs protest death of Palestinian infant in deadly West Bank arson (Haaretz)