So after u get all JF 17 till 2020 what u do to these old F 16 pak is not in such rush of Jets like F 16 Since we already have that type of jet not going to make any significant difference in sharpening PAF paf always beat drums of lesser funds even misusing 1 million on rusted airframe is crimnal act with downed economy as we know it will remain same instead of wasting 6 mill on 1 jet it makes almost 30 mill of all used F 16 if we keep that money and build more money in next 4 years we can easily have money to buy any air superiority jet which we lackOld F-16s come in various forms. For example, the ADFs the PAF acquired from Jordan are capable of using the AMRAAM. Second, the PAF already has a solid fleet of BVR capable fighters, e.g. the JF-17 Block-I and Block-II, as well as the F-16 Block-52+ and MLU. These used F-16s are there to basically plugin the short-fall in basic air defence duties and maintain numbers.
The purpose behind getting the used F-16s is to enable the PAF to easily phase out a large bunch of old airframes, and to do it very cheaply (i.e. maybe for $5-6mn a plane). So that fits within the PAF's budget constraints and it is considerably cheaper than going the J-10 route.
Moreover, these used F-16s will be holding the spot until such time additional JF-17s roll-out of PAC. After 2020 we're talking about Block-IV, Block-V, etc. So instead of spending a lot of money on J-10, the PAF is spending very little money on the F-16s, and it is deferring most of its funds back into JF-17.
How is this a bad thing?