If there have been two weeks of military build-ups, with perhaps another two weeks of more build-ups, then we can expect a major build-up of military equipment for CENTCOM.That's what many laymen (especially in the West) said about Ukraine as well. In fact they thought less than a few weeks, only a few days. Iran is not under sanctions from the countries that matter, not being able to buy a Ford chevvy or Italian tomatoes doesn't limit Iran from equipping hordes of "good enough" troops.
Will Iran lose in the longer term? Yes, assuming US affords to spend all their effort their for years. But that's a pretty big assumption.
Unlike Russia, US can't put all their efforts on hold for the duration of a war like this. So I don't think anything will happen. US also needs way more forces in the theatre.
The point is that Iran is only really strong in air defense, where it can offer really tough opposition to the Americans, but the launches to suppress air defense can be standoff, which would give a symmetrical advantage to the Americans in the bombing campaign, they would have no reason to put their aircraft within range of Iranian air defense, especially HIMAD.
For a grueling and long bombing campaign hitting all the main Iranian targets it would be something like this assessment:
Israeli-Palestinian Conflict and other Related Conflicts in the Middle East (read the rules in the first post)
https://www.cbsnews.com/news/iran-hezbollah-targets-after-israel-beirut-strike/ The Permanent Mission of the Islamic Republic of Iran to the United Nations has warned that Hezbollah's response to Israel's assassination of one of its top commanders, Fuad Shukr, in a suburb of Lebanon's capital...
www.sinodefenceforum.com
In fact, perhaps the results of True Promise I/II have encouraged Americans and allies to act now rather than delay until the future. Iranian deterrence has failed completely.