I won't be surprise if yanks offer f18 super hornets for PN to suppress SU 35 deallove it. More are being cleaned up and coming. Btw, Viper from PDF has been saying it for a while that more used Vipers are coming.
Even new ones are on the card but Pakistan doesn't like the delivery dates as they'll get manufactured in 2018 and final flying clearance into PAF towards the end of 2018 - early 2019. LM's entire assembly systems has been taken up by higher priority items such as -35's in very large numbers.