It would actually take 8---10 years to a start rocking and rolling in a new aircraft. When the first F16's came out---it took the u s pilots 4---8 years to really know the plane-
Not like the JF17----which would take 10---15 years to mature.
PAF has missed the 'boat ride' in the earlier part of 2000
And have 350---400 4th gen + aircraft.
I am going to answer the above bullets in order:
1) 8-10 years was the case when the technology wasn't so advanced and you'd have to fly the aircraft physically to learn its characteristics. Plus if you had a few hundred pilots in the line for training on a new platform, the pilot to the twin seater trainer would be a lot as the trainer would be much less in numbers. So it took that long. Now, you have simulators that give you about 80-85% real flying experience. So you are trained MUCH faster. So take about 3 years average for a batch of pilots to train on all flight envelop, both through the simulator and the physical jet flying. In PAF's case, I'd go to 4-5 years max. Changes being made to the plane are a whole different issue though.
2) JFT will only have two advanced blocks AFAIK. So, its maturity will end by 2018 I think as it's supposed to be forming a lower tier (which is currently being called Mid Tier due to the lack of another jet that would be higher end like FC-20).
3) What Boat Ride are you referring to? Please explain. PAF definitely has some catching up to do due to sanctions during the 90's. But it is doing good to catch up and I think if the funds were available, it would've caught up for the most part. I'd give it 3-5 more years if the new gov't does what its supposed to do to kick start the economy. But do explain what Boat Ride please. I'm curious to know.
4) I agree with the number. The PAF as a defensive arm, needs about 400 3.5 - 4th gen jets with BVR's at the least.