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  No one is invading Iran, least of all the US... There is no need to, precision strikes would be all that is necessary here and Iranian air defenses are a joke.  And there is nothing Iran could do in response other than lob SRBMs at Israel and Saudi Arabia, which not only wouldn't accomplish much, but would invite further strikes they are incapable of stopping.  Or Israel could just escalate their operations on the ground, just look up all the Iranian nuclear scientists they've assassinated in recent years... They killed one of them with a remotely operated robot that had a machine gun strapped to a few years ago.
  And people might fear Iran blockading the Strait of Hormuz in retaliation, but even that isn't an option for them these days... Its more a liability for themselves than for Saudi Arabia.  Saudia Arabia has long anticipated conflict with Iran, especially since the Iran-Iraq War and attacks on tankers in the Persian Gulf.  In the 80s they built the East-West pipeline and can divert upwards of 50% of their entire crude production to the Red Sea and transport it from there; and could probably rapidly expand that capacity if necessary.  Conversely, the Iranian government generates almost all of its revenue from oil, gas, and other material exports, 100% of which are transported through the Strait of Hormuz... A shooting war in the Persian Gulf would literally bankrupt the Iranian government and destroy their economy.
context: You know, as much as we’ve been involved in Middle East conflicts over the past few decades, I think a scenario like this would be what would actually pull us into a new Gulf War, as opposed to a U.S.-Iran standoff. 
  The American public is exhausted from the GWOT, our focus has been redirected towards Europe and the Asia-Pacific, our forces reoriented and returned to an emphasis on great-power conflict and conventional war, and I don’t think a President with half a brain cell would send us full force into the Middle East again. 
  But the Saudis are in a new Cold War with Iran for control of the Gulf and the Israelis just do whatever the Israelis wanna do. What’s more likely is that Israel or Saudi Arabia end up in a fight with Iran whether they develop a nuke or not, and we end up getting dragged into it piece by piece until we wake up one day and we’re leading the charge again, god forbid. 
  And as a Marine, there’s not a whole lot of places I’d be less excited to operate in than Iran. It’s an absolute nightmare for an attacking or occupying force, far more so than Iraq or Afghanistan ever was. Even if a ground invasion was off the table, which for the love of god it had better be, we’re still looking at a miserable engagement in the Gulf, not to mention the havoc that Iranian-backed militias will be wreaking in the rest of the region.