Of course, such an attack does not make any sense by itself, it will delay Iran's operations by a couple of years perhaps (which they are being delayed now anyhow due to IAEA inspections), but buy Israel an eternal suicidal enemy. In addition, Israel will suffer a backlash from the US, which no doubt will be attacked by Iran in retaliation. But I assume that what convinces Netanyahu most is his own political survival. So my expectation is that there will be no Israeli attack on Iran before the next Israeli elections.
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from the article: U.S. anxiety grows over possible Israeli plans on Iran