Atrios thinks it's weird that there isn't more discourse over the possibility of war with Iran. I get that, although since the discourse would be dominated by hawks (it always is) the ongoing silence might not be such a bad thing.
Part of the reason, I think, is that "war with Iran," if it comes, would be a strange creature indeed. Neither Israel nor the US can invade Iran even if they wanted to. Nor can Iran invade Israel. It's 600 miles through Jordan and Iraq to get to Israel from the border of Iran.
The only thing left is an air war, and that wouldn't be easy. Most of Iran is only barely in range of either Israeli fighters or American carriers in the Med. Carriers in the Persian Gulf could do better, but fighters don't carry big payloads in any case and can inflict only limited damage. Heavy bombers can fly from the mainland US, but it's not easy and we couldn't support very many missions.
Plus it's risky. Iran has legit air defenses and can shoot stuff down.
That leaves two things. First, we could wreak hell on Iran's Persian Gulf oil facilities. However, that risks both serious retaliation and damage to shipping channels that would cut off world oil supplies. Purely for reasons of our own national security, it's pretty unlikely.
Second, both sides have missiles. And missile defenses. How much damage could the US and Israel do with a serious commitment to a missile war with Iran? I don't know, but that would be one weird war if it were just two sides launching waves of missiles at each other. We could obviously keep this up longer than Iran, but it's unclear how much it could accomplish.
Right now, Israel's war with Iran is limited to proxies (mainly Hezbollah), cyberattacks, sabotage, and so forth. A real live hot war with Iran would increase that intensity, but mostly via missile attacks unless both sides decided to risk turning the Persian Gulf and the Strait of Hormuz into wastelands.
In other words, my best amateur guess is that a full-scale war with Iran isn't really possible short of a provocation that provoked a truly massive commitment from the US—something on the order of the Gulf War or Vietnam. That's hugely unlikely, and short of that Israel and Iran are just too far apart to do much damage to each other. So there's really no prospective war for the discourse to obsess about.
POSTSCRIPT: This is all unrelated to the possibility of a sustained American campaign to knock out Iran's nuclear facilities. That would be hard but probably doable if we put our minds to it. Israel, on the other hand, doesn't have the military resources to pull this off. It's the US or nobody.