Middle East Peace?

Having recently returned from Israel, I heard a very interesting seminar and lecture that proposed the following statement: Israel's real problem is not the Palestinians, nor is it Lebanon; rather Israel's greatest threat to its existence (let alone peace) is Iran. The speaker, Neil Lazarus, proposed that the Pentagon's worst nightmare would be an Israeli preemptive strike on Tehran and Iran's nuclear program and then the retaliation from Iran, Hezbollah and all other anti-Israel countries surrounding it attack. What is the United States going to do then? 

I wonder about all of your opinions regarding peace in the Middle East. Do you think it needs to come from Israel or from its neighbors, or both? What is hindering the process? What is the objective in the region both for the United States, the world, and more specifically the parties involved? 

I think it is extremely dangerous to have someone like Ahmedinejad in power and even more frightening to discover that he has access to nuclear weapons. Not only is this a problem for the United States, but also it is an imminent and extremely serious threat to Israel. However, how does one deal with someone who refuses to follow acknowledge Israel's right to exist, denies the Holocaust,  refuses to follow U.N restrictions and poses a huge threat to global security when we need things from him, namely oil. The U.S has deep ties to Iran in terms of getting a huge amount of oil from the region and it would NOT be good in this economy to do something drastic and lose that large percentage of the oil market. So, I guess the question is what is to be done?