No big deal. The thousands are military types who HAVE to march, or else. Remember the teeming throngs who worshipped Saddam each time he made a public appearance? As soon as the mullahs in Iran go down, the people will celebrate as they did in Romania when Mr. Ceaucescu was killed.
A LOT of the Iranians hate the mullahs. Iran might fall easier than Iraq because they are all the same sect of Islam. They are all Shia and they are also not Arabs.