Lol, seeing the title of your thread, at first I thought you were talking about buying a restaurant (diner). But I guess you're referring to the dinar. ;P
Not for a long (long) time, if it does increase in value I'd imagine the bank would issue new bank notes to stop people taking advantage in this way. I have 200 Iraqi Dinars (worthless) and they still have pictures of Saddam on.
Maybe he just wants to set up a diner in Iraq? I hear Iraq is the next big tourist hotspot, could be good business.