I completely agree with you in that , their economy is 1/3 the size of turkish economy so the effect will come in next few years . After all iran is a police state , they suppress people harshly to avoid showing their internal suffering .
Iran is at breaking point under US sanctions – and its leaders feel the heat | World news | theguardian.com
ISIL will be a strain on both iraqi and iranian economy with iraq now losing kirkuk the shia goverment will entirely rely on their oil in the south to finance the war with isil and strengthen internal security in south.
You know people in basra are not happy feeding the rest of iraq , they demanded more fees etc as this war with isil goes for years other parts of southern iraq will seek independence like rich oil province in basra .