there is no way in hell that Pakistan Air Force would go for an American option, even if it were free!
Dizast, they already have...and they did so when it wasn't free.
And through 2014 they continued to spend to get more and upgrade the F-16s they have. They are very capable, relevant, dangerous aircraft to this day...and Pakistan has quite a few of them.
Last year Turkey delivered the last four upgrades they were doing for Pakistan. Also last year Pakistan took delivery of a squadron of F-16s from Jordan.
The 76 F-16s that Pakistan has and has upgraded represent their existing front line, modern force.
Now, the Thunders are going to substantially compliment this force...but they are not meant to supplant the Falcons. They are replacing other older Chinese and French aircraft.