I dont see the 16s in the role which is the M3/5 current role ie ground attack. If at all we will have a MR platform doing the job it was meant to do. This also depends on whether we can get more platforms from US. Whether this role will go to the JFTBs or not remains to be seen but personally I dont see the J10s coming any time soon. As to the 60 million cost one of the main beef between the PAF and PLAAF was thatcthe expected cost of J10 A was quoted around 48 million whereas PAF wanted to pay 28 million. The cost of Cs is going to be much higher and likely to be around 60 million. I suspect there is some bargaining going on between PAF and PLAAF and the 16s are being put against the Cs to get a favourable deal.F16's taking over from Mirage 3's only in the ADA role. What about ground attack? A/c's have structural lives, which can be increased, but ultimately PAF does need a replacement, and there is no way a J10C costs $60m.
As to your statement: " time and cost of integration of hardware manpower development " This is the cost of doing business effectively. If you keep cutting corners, sooner or later it will come back to bite you in the rear.
What PAF pulled of last feb, may not alwasy be possible, and I'm sure they are prepared for it.
Let us see how this will pan out. I dont see anything till the block 3 gets inducted. PAF has never inducted 2 platforms simultaneously so this is unlikely to bappen. As I said earlier I am only surmising and you are a professional in the know. So I M happy to be proven wrong.