as always: imho (!)
the usa will "bomb bomb bomb bomb iran" for a few weeks - as they wanted since 1979:
more details to the song
* https://en.wikipedia.org/wiki/Bomb_Iran
1. a few weeks in they will run out of ordnance to drop
2. they will declare victory and leave
3. iran wins by not being beaten
i think 2 things are possible but very unlikely - eg. small single digit per cent probability:
* successful regime change
* a really long war - like in afghanistan or irak (~ 10 or up to 20 years)
just my 0.02€