Iran is now acting like Iraq during the First Gulf War. Iraq had a powerful military at that time, but its overconfidence led to its downfall. After the First Gulf War, Iraq never recovered and became a shadow of its former self, even though it sits on huge oil reserves.
If everything is destroyed, Iran will take ages to recover if it ever recover, while it cannot inflict comparable damage on Israel, the US, or the Gulf countries. In contrast, those countries would recover very quickly compared to Iran.
Iran has proved its point. Now its time to cool things otherwise this rhetoric will not take Iran anywhere.