lomapaseo:
I really do feel that ICAO needs to address the shortfalls here for the future and not just action on this one event.
2 answers : a) ICAO did not react to this one event . The policy I quote earlier is much older. and was just renewed after MH17.
b) ICAO is just an organisation made of sovereign States. It has zero power to force a Member State to do anything against its will. Many States where there are currently conflicts , either deny it , and/or need the hard currency revenue that flights coming into their airspace or airports generate .They do not want their airspace closed.
Regarding Iran, as mentioned earlier, the drawing on page 14 the interim report explains the key failures that led to the accident ,but the second footnote on that page is interesting in our discussion .It says everything is normal now., but remember this is the assessment of the Iranian CAA, not the result of an investigation by an independent international organisation .