There have been many countries from Indonesia, Azerbaijan, to even Turkey considering the JFT(as many folks in PAF call it), it seems to me that the main hurdle is Russia's engines. Obviously Russia does not want to help China&Pakistan sell these aircraft to potential Russian customers.
Indonesia is buying 16 x KAI TA-50 combat trainers, and paying 20% R&D cost for KAI KF-X with future order of 50 aircraft. Turkey is buying 116 F-35's, with local assembly under license. Turkey is also working on future TFX fighter aircraft.
The issue with FC-1/JF-17 is that countries that would buy it as their primary fighter aircraft tend to be poorer nations, versus richer ones can afford better. It's possible that the JF-17 missed the trainer & combat trainer market demonstrated by the T-50/TA-50. While richer countries may prefer to buy more expensive and capable aircraft, they may also have been interested in a 2-seat trainer/combat trainer variant of the JF-17, as being more modern design than the K-8.