This could get ugly, really ugly, and all because the world didn't stop the problem 5+ years ago. A thousand things could happen to change everything, such as the people of Iran rioting and the country descending into chaos, so no one really can predict anything with certainty. Yet the possibility that this is a trigger event that plunges the world into chaos should frighten the world into acting now and not let Israel act alone.
Zachariah chapters 12 & 14 tells us what happens next.