Israel is only a threat to Iran if Iran chooses to try to liquidate her. Iran is a threat to Israel and we are not talking in the future tense. Both in the past and currently, Iran is actively trying to destroy Israel using surrogates. She (and the surrogates) will be wiped out if the surrogates get to the point of success but only if that happens. So, yes, we should all be concerned with Iran acquiring that kind of weaponry.
Iranian parliamentary panel gives conditional nod to nuke deal (Reuters)