Prediction again:
Israel instigates attack against Iran. US stupidly backs Israel, long war ensues. Gigantic anti-Semetic backlash in the US. Entire Middle East gangs together, Israel either scaled back drastically or does not exist.
Certainly a possibility, although my prediction (naive 15 year old that I am ), goes something like this:
Iran launches attack against Israel, full scale warfare. US quickly joins Israel, launches massive bombing campaign against Iran, targeting mostly civilians.
And the sick thing is, you'd be all for this 100%.