One day very soon Israel will cease to be seen as a "vital interest" for the US
what then?
You seem to be having trouble understanding my post. I said the US and Israel share some vital interests regarding Iran. The US and Israel also share other vital interests in the ME, namely maintaining peace, and this interest is the basis for the US's policy or arming both the Israelis and the Arab states to the point where neither feels threatened by the other. It is foolish to think that this will not remain a vital interest of the US.
You seem to be basing your hope of the US losing interest in Israel's welfare on two assumptions, both false. First, you hint at some sort of united Arab/Muslim effort against Israel, but there is no unity among the Arabs/Muslims. Second, you seem believe that without US military aid, Israel would not be able to survive, but there was almost no US military aid until after the 1973 war and Israel handily defeated united Arab forces that were well supplied and trained by the Soviets.
Today, Israel produces some of the most advanced weapons systems in the world, and if memory serves, is the fourth largest exporter of weapons in the world. If necessary, Israel is capable of producing just about everything it gets from the US, including advanced aircraft and missile systems, but without US aid, because of its small size, it would be forced to sell much of these weapons systems to keep the unit cost of production down, and this would produce a formidable flow of advanced weapons systems that might work against US interests. Furthermore, since Israel lacks strategic depth, without the assurance the US would resupply any losses it suffered in war, Israel would have to preempt potential adversaries' ability to inflict such damage and this would lead to more tension and conflict in the ME, negatively effecting US vital interests in the region.
By continuing its even handed policy of supplying both Israel and the Arab states with sufficient military strength so that none feels threatened by the other, the US is protecting its own vital interests as well as helping Israel and the Arab states to protect their's.