They'll try but the war is not popular back at home.
The Syrian war is costing Iran $10-$20 billion a year, the vast majority of Iranians live in poverty except for the mullahs and their families.
They've had 40 years of 'Death to America', 'Death to Israel' and no results and it's getting very, very old.
As long as Israel pounds the Iranians from the air and stays out of a ground war things should go well. I am watching to see if the Iranians try and pull the Saudi’s into open conflict with them at some point. The Israelis rule the air pure and simple and should be able to pound the Iranians in Syria into oblivion with selective and violent strikes.