If Israel flops this war up like the last war with Hizbollah in 2006, the United States will look at Israel as an ally that can't pull it's weight. And all of Israel's enemies will be emboldened to attack her harder and more frequently.
I have to admit, I don't have much faith that Israel will decisively win the next war, against anybody. Not with the leaders Israel has.
The war Israel is excellent at is throwing women and children out of their homes in the dead of the night- to make way for an Arab state.
http://www.debka.com/article/22242/Wartime-tasks-split-US-to-smash-Iran’s-missiles-Israel-tackle-Syria-Hizballah-