Well, they would probably like the bombing of their territory to stop. So, if Israel and the US stopped, I'm pretty sure they will too. If they don't, Israel and the US can just start it again.
Now, what happens after the bombing stops is a different question. If the Iranian regime was on the fence about continuing their nuclear weapons development program before, they will be greatly motivated to continue now.
The only possible way to have any chance of stopping that will be - you guessed it - boots on the ground.
As for their support for the terrorist groups you mentioned, well I don't have an answer to that. One thing is certain though - starting this war was not even remotely a good idea.