In 2002, a high-ranking deputy in Iran suggested that Iran may not be an oil exporter at all past 2007 if their internal consumption patterns didn't continue.

http://www.tehrantimes.com/archives/Description.asp?Da=10/28/2002&Cat=9&Num=1

The situation may be more extreme that you have already noted.

Ooops -- I meant if internal consumption patterns didn't change.