I would have never done what the Iranians did here. They basically played one of their best cards to take attention off their nuclear program. There is no evidence that the world powers will ever get together to stop Iran from getting nukes.
If I was playing this real world game of Stratego, I would have held Hezzbollah and their 13,000 rockets for a response to an attack, either by Israel or any other power.
That's exactly why I don't think Iran approved this and Hezbollah screwed up and didn't expect the Israeli response. This is much to Israel's advantage not to have rockets raining down on them from Hezbollah and Hamas when the confrontation with Iran comes.
IMO, Iran armed Hezbollah just for that ocassion...now, what do they do. It looks like Israel will now have foreign troops (at some time) protecting their northern border. I expect Iran is pissed, big time.
Israel's Arrow and Patriot missile batteries can deal with the larger rockets that will be fired from Iran. Israel is much stronger now.