Come on ......there are almost 2400+ F7's sold during 26 years (1980s - 2006)....sold to almost 18 countries (almost ~92 per year). Now keep in mind that F7 came in 2006 was entirely improved then those came in 1980's.
Now the process of evaluation is much expidiet then before (1980s to 2000's) and you will see more improved versions in coming years in the form of JF-17 Block II n III (Block III expected to comeout in 2016). And all those 18 counties are going to retire F-7's in near future......there purchasing power is not high that they can buy 30 million AC......Surely they will go to China......n JF-17 would be the best option they would have......
China n Pakistan surely sell minimum 300 pieces (thats for sure @ the rate of 40 to 50 pieces per year from both PAC & CAC till 2016 till arival of Block III ) they will earn near to 5 billion.
150 Block I (2009)(including PAF 50) = 100 export x $17m = $1.7 Billion
250 Block II (2012)(including PAF 150) = 100 export x ~$22m = ~$2.2 Billion
200 Block III (2016)(including PAF 100) = 100export x ~$26m = ~$2.6Billion
$1.7B + ~$2.2 B + ~$2.6 B =
~$6.5Billion