JF-17 block III is good enough to deal with any front line fighter Iran has but has a low operating cost so can bomb Houthi rebels in Yeman more affordably then an a F15. Look what happened after the Jamal Khashoggi murder, many USA official ridiculed KSA. The USA has shale oil and doesn't need KSA anymore. Spare parts for those F15's could stop and they will end up like the Shah's F-14s. That is not a concern with JF-17. KSA also wants to develop its own defense industry. Pakistan and China will transfer any tech needed by KSA to build JF-17's. I think KSA is seriously considering JF-17.