If Israel is destroyed, what other Jewish State are they going to have right next door to them whenever they need to conveniently blame their own internal corruption / civil wars on? The closest country after Israel would be the U.S. and it would be much harder to blame the CIA whenever Hezbolla wants to murder another Lebanese politician? If you ask me, I think Arab nations need Israel more than they realize, otherwise it's only a matter of time till Arab nations themselves self destruct.
UN: Gaza could be 'uninhabitable' by 2020 if trends continue (AP)
from the article: Lebanon PM: UN must probe claims of Israeli complicity in Hariri murder