Ahmadinejad is out of Iranian politics in just 1 year... how high do you think the chances are that he will ''attack'' while he is still there ?
In Israel we believe that Ahmadinejad represents the regime. Maybe Ahmadinejad is out in 1 year, but unfortunately the regime will probably remain the same.
You might also think that Israel's problem is Netanyahu, and if he is gone, Israel will never attack. This is not the case. Any Israeli PM will act more or less in the same way regarding Iran's military nuclear project.