The IRGC would never give up on their MRBMs and I can understand why. Because it is Iran's only deterrence at this point.
Iran lacks capable armed forces. Our air force, navy and ground forces still use many of the equipment bought during the Pahlavi era. Iran's ballistic missiles are all that Iran has at this point.
To resolve this issue, Iran needs some sort of guarantee that it won't need to use our MRBMs. In other words, Iran needs some sort of normalization with both the United States and Israel, which seems impossible with the current system in power, particularly with the IRGC.
So, in addition to our ballistic missiles, expect the IRGC and anti-Israel factions inside Iran to be hit really hard in the near future. I think the oligarchy in Iran would love the normalization of ties with the US and the West, even if it means to give Israel some sort of recognition, or security guarantees.